{"title":"Underlayers","description":"\u003cp\u003eUnderlayer shirts and pants for 4 cycle LO206 kart racing. Nomex, winter, and cooling layers worn under a kart suit or fire suit for club weekends.\u003c\/p\u003e","products":[{"product_id":"alpinestars-ride-tech-winter-pants","title":"Alpinestars Ride Tech Winter Pants","description":"\u003cp\u003eThe Alpinestars Ride Tech Winter Pants are base layer underwear built for core temperature regulation in cold conditions. They suit kart drivers who need reliable thermal protection under racing gear during 4 cycle racing. These pants help maintain comfort when riding in lower temperatures by providing targeted warmth and moisture management through specialized fabric layers.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDual density fabric on exposed areas\u003c\/li\u003e\n\u003cli\u003ePolypropylene and elastane construction\u003c\/li\u003e\n\u003cli\u003eMaterial that will not melt under abrasion\u003c\/li\u003e\n\u003cli\u003eTubular seamless build\u003c\/li\u003e\n\u003cli\u003eCompression fit for muscle support\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThese pants deliver extra moisture wicking through the dual density layers to keep the body comfortable when temperatures drop. The compression fit helps reduce fatigue while the seamless tubular construction avoids pressure points during extended sessions. The dual density approach covers the most exposed areas with additional fabric for better thermal protection without compromising overall breathability or movement. Developed for cold weather riding conditions, the pants use comfortable moisture wicking material for optimal thermal protection in every ride.\u003c\/p\u003e\u003cp\u003ePair them with the matching winter shirt for consistent coverage on cold days. The fabric stays effective as an underlayer without adding bulk. This setup supports muscle function and maintains dryness next to the skin for prolonged use in chilly environments. The polypropylene and elastane blend ensures the material will not melt under abrasion while delivering a secure yet flexible feel.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan these pants be worn under any racing suit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, they function as a winter underlayer for Briggs LO206 and similar setups.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do the dual density layers work?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey add extra moisture wicking and thermal protection on the most exposed areas while keeping the rest of the garment lightweight.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the fabric safe near heat sources?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe polypropylene and elastane blend will not melt under abrasion.\u003c\/p\u003e\u003cp\u003eCompare with the \u003ca href=\"\/products\/alpinestars-zx-evo-v2-underlayer-pants\"\u003eAlpinestars ZX EVO v2 Underlayer Pants\u003c\/a\u003e for a fire resistant alternative instead of cold weather focus.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/Alpinestars-underlayer-size_chart-image-CMS.png\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"XS\/S","offer_id":54494286905662,"sku":"4752217-106-XS\/S","price":109.95,"currency_code":"USD","in_stock":true},{"title":"M\/L","offer_id":54494286938430,"sku":"4752217-106-M\/L","price":109.95,"currency_code":"USD","in_stock":false},{"title":"XL\/2XL","offer_id":54494286971198,"sku":"4752217-106-XL\/2XL","price":109.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/alpinestars-ride-tech-winter-pants-IMAGE.jpg?v=1790143338"},{"product_id":"alpinestars-cooling-vest","title":"Alpinestars Cooling Vest","description":"\u003cp\u003eThe Alpinestars Cooling Vest is a heat layer for hot 4 cycle racing, including Briggs LO206 sessions where the suit is already doing its job and you still need to cool your core. It is not a race suit and it is not a winter shirt.\u003c\/p\u003e\u003cp\u003eThe cooling system is a refillable water chamber that releases moisture as you drive, to regulate temperature. To refill it, detach the chamber, fill it with water, and reattach it. The product notes say the effect lasts for hours depending on conditions, then you refill. It does not describe ice packs or a pump. Do not treat it like a powered cooler.\u003c\/p\u003e\u003cp\u003eThe vest is a three-layer textile with a moisture-wicking fleece lining. Stretch inserts on the sides are there for a close fit so the vest does not bunch under a suit. Ventilation ports are placed for airflow. The lining is described as anti-bacterial, and the vest is machine-washable. It is meant to be light. Sizes cover a range of body types. Use the size chart. A loose vest will not put the wet layer on your core, and a tight one will fight the suit.\u003c\/p\u003e\u003cp\u003eYou can wear it under racing gear. Get the suit off between sessions when you can. The suit itself is not a cooling system. This vest is the layer that adds the water chamber and the vents while you are still in the seat. It does not replace water, shade, or taking the suit down when the schedule allows.\u003c\/p\u003e\u003cp\u003eThere is no sibling cooler linked on this page. The Ride Tech pieces in the underlayer collection are the winter shirt and pants, built for cold, not for a water chamber. Use this vest when the session is hot and you want that refillable layer under the suit.\u003c\/p\u003e\u003cp\u003eSwift Karting lists it as a cooling layer for hot Briggs LO206 weekends.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/Alpinestars-underlayer-size_chart-image-CMS.png\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Small\/Medium","offer_id":54494290542910,"sku":"4751518-922-S\/M","price":199.95,"currency_code":"USD","in_stock":false},{"title":"Large\/XLarge","offer_id":54494290575678,"sku":"4751518-922-L\/XL","price":199.95,"currency_code":"USD","in_stock":true},{"title":"XXLarge\/XXXLarge","offer_id":54494290608446,"sku":"4751518-922-2X\/3X","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/alpinestars-4751518-922-cooling-vest-front_image.jpg?v=1790143349"},{"product_id":"alpinestars-ride-tech-winter-shirt","title":"Alpinestars Ride Tech Winter Shirt","description":"\u003cp\u003eThe Alpinestars Ride Tech Winter Shirt is a cold weather base layer built for kart racers who need core temperature regulation during 4 cycle racing. Dual density fabric adds extra moisture wicking on exposed areas while the material stays comfortable against the skin. It is developed specifically for cold weather riding conditions and serves as a winter underlayer for Briggs LO206.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePolypropylene and elastane construction\u003c\/li\u003e\n\u003cli\u003eDual density fabric on exposed areas\u003c\/li\u003e\n\u003cli\u003eWill not melt under abrasion\u003c\/li\u003e\n\u003cli\u003eTubular seamless construction\u003c\/li\u003e\n\u003cli\u003eCompression fit for muscle support\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThe shirt uses a compression fit that supports muscles and reduces fatigue on longer sessions. Seamless tubular construction eliminates pressure points so the layer sits smoothly under a race suit without bulk. The dual density fabric covers the most exposed areas to deliver added thermal protection when temperatures drop.\u003c\/p\u003e\u003cp\u003eMoisture wicking fabric pulls sweat away to maintain thermal protection in cold conditions. The fabric blend is chosen specifically so it will not melt if exposed to abrasion. This makes the shirt a reliable choice for keeping the body comfortable during winter track days while providing muscle support through its compression design.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this shirt suitable for cold track days?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It is developed for cold weather riding with double density coverage on the most exposed zones and moisture wicking to keep the body comfortable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the fabric provide any safety benefit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe polypropylene and elastane blend will not melt under abrasion, adding a layer of protection in the event of contact.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow should it be cared for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWash in cold water and hang dry to preserve the compression and wicking properties of the fabric.\u003c\/p\u003e\u003cp\u003eCompare this option with the \u003ca href=\"\/products\/omp-karting-winter-shirt\"\u003eOMP Karting Winter Shirt\u003c\/a\u003e for a seamless thermal weave that traps warmth without bulk, the \u003ca href=\"\/products\/chillout-pro-sport-underlayer-shirt\"\u003eChillout Pro Sport Underlayer Shirt\u003c\/a\u003e for FIA and SFI approved thermal regulation that reduces skin temperature, or the \u003ca href=\"\/products\/omp-first-nomex-shirt\"\u003eOMP First Nomex Shirt\u003c\/a\u003e for flame retardant Nomex construction with moisture wicking.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/Alpinestars-underlayer-size_chart-image-CMS.png\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"XS\/S","offer_id":54494290673982,"sku":"4752117-106-XS\/S","price":139.95,"currency_code":"USD","in_stock":true},{"title":"M\/L","offer_id":54494290706750,"sku":"4752117-106-M\/L","price":139.95,"currency_code":"USD","in_stock":true},{"title":"XL\/2XL","offer_id":54494290739518,"sku":"4752117-106-XL\/2XL","price":139.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/Alpinestars_Ride_Tech_Winter_Shirt_Image.jpg?v=1790143352"},{"product_id":"omp-ks-karting-long-sleeve-top","title":"OMP KS Karting Long Sleeve Top","description":"\u003cp\u003eThe OMP KS Karting Long Sleeve Top is a high-performance karting underwear top designed to keep drivers comfortable during intense sessions on track. Constructed from lightweight, insulating, and highly breathable fabrics, this long-sleeve base layer helps regulate body temperature while efficiently managing moisture for kart racers who need consistent performance across varying conditions.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLightweight karting underwear top for maximum comfort\u003c\/li\u003e\n\u003cli\u003eAdvanced Dryarn® high-performance fiber construction\u003c\/li\u003e\n\u003cli\u003e3D structure promotes rapid moisture and sweat evacuation\u003c\/li\u003e\n\u003cli\u003eBreathable fabric helps maintain optimal body temperature\u003c\/li\u003e\n\u003cli\u003eInsulating properties provide comfort across varying conditions\u003c\/li\u003e\n\u003cli\u003eLong sleeve design offers full upper-body coverage\u003c\/li\u003e\n\u003cli\u003eSoft, comfortable fit suitable for extended wear\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for karting applications\u003c\/li\u003e\n\u003cli\u003eAvailable in Blue, Black, and Orange color options\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThe seamless design minimizes irritation and enhances comfort under karting suits during long race weekends. The innovative Dryarn® construction delivers excellent moisture transport while maintaining a soft, comfortable fit against the skin. The fabric is engineered to balance insulation and airflow, helping maintain comfort in a wide range of track conditions.\u003c\/p\u003e\u003cp\u003eYouth sizes cover 8-10 years and 10-12 years. Adult sizes cover XS\/S, M\/L, and XL\/XXL. The long sleeve design offers full upper-body coverage that works well beneath a karting suit for extended wear without adding bulk.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is Dryarn® fabric?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDryarn® is a high-performance technical fiber known for its lightweight feel, moisture management capabilities, breathability, and thermal regulation properties.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the KS Top Long designed specifically for karting?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The KS Top Long is engineered specifically for kart racers who need lightweight comfort and effective moisture control beneath their racing gear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the 3D fabric structure help performance?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 3D knit construction promotes rapid sweat evacuation, helping keep the driver dry and comfortable during demanding driving conditions.\u003c\/p\u003e\u003cp\u003eCompare this base layer with the \u003ca href=\"\/products\/omp-first-nomex-shirt\"\u003eOMP First Nomex Shirt\u003c\/a\u003e for added fire resistance or the \u003ca href=\"\/products\/omp-karting-winter-shirt\"\u003eOMP Karting Winter Shirt\u003c\/a\u003e when extra warmth is required.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"White \/ 8-10 Years (Child)","offer_id":54494328095038,"sku":"KE0-3029-A01-020-810Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"White \/ 10-12 Years (Child)","offer_id":54494328127806,"sku":"KE0-3029-A01-020-1012Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XS","offer_id":54494328160574,"sku":"KE0-3029-A01-020-XSS","price":99.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Medium\/Large","offer_id":54494328193342,"sku":"KE0-3029-A01-020-ML","price":99.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XL\/XXL","offer_id":54494328226110,"sku":"KE0-3029-A01-020-XLXXL","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ 8-10 Years (Child)","offer_id":54494328258878,"sku":"KE0-3029-A01-041-810Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ 10-12 Years (Child)","offer_id":54494328291646,"sku":"KE0-3029-A01-041-1012Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ XS\/S","offer_id":54494328324414,"sku":"KE0-3029-A01-041-XSS","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ M\/L","offer_id":54494328357182,"sku":"KE0-3029-A01-041-ML","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ XL\/XXL","offer_id":54494328389950,"sku":"KE0-3029-A01-041-XLXXL","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 8-10 Years (Child)","offer_id":54494328422718,"sku":"KE0-3029-A01-071-810Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 10-12 Years (Child)","offer_id":54494328455486,"sku":"KE0-3029-A01-071-1012Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XS\/S","offer_id":54494328488254,"sku":"KE0-3029-A01-071-XSS","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ M\/L","offer_id":54494328521022,"sku":"KE0-3029-A01-071-ML","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL\/XXL","offer_id":54494328553790,"sku":"KE0-3029-A01-071-XLXXL","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Orange \/ 8-10 Years (Child)","offer_id":54494328586558,"sku":"KE0-3029-A01-090-810Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Orange \/ 10-12 Years (Child)","offer_id":54494328619326,"sku":"KE0-3029-A01-090-1012Y","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Orange \/ XS\/S","offer_id":54494328652094,"sku":"KE0-3029-A01-090-XSS","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Orange \/ M\/L","offer_id":54494328684862,"sku":"KE0-3029-A01-090-ML","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Orange \/ XL\/XXL","offer_id":54494328717630,"sku":"KE0-3029-A01-090-XLXXL","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-karting-long-sleeve-underwear-top-front-image.jpg?v=1790144029"},{"product_id":"omp-karting-winter-shirt","title":"OMP Karting Winter Shirt","description":"\u003cp\u003eThe OMP Karting Winter Shirt is a long-sleeve base layer built for kart racers who train or compete when temperatures drop, including 4 cycle LO206. It keeps the body warm and dry while delivering the comfort and flexibility needed to perform in cold conditions, whether on winter track days or during a chilly morning jog.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSeamless thermal weave that traps warmth\u003c\/li\u003e\n\u003cli\u003eLow-bulk construction for layering\u003c\/li\u003e\n\u003cli\u003eStretch fabric for full range of motion\u003c\/li\u003e\n\u003cli\u003eDeveloped with kart teams for real track use\u003c\/li\u003e\n\u003cli\u003eBreathable design that manages moisture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eThis shirt sits close to the body without restriction, so you can grip the wheel or move freely during sessions. The seamless construction reduces bulk under a kart suit while still delivering insulation on cold track days or during winter training runs. It balances breathability with thermal regulation to help maintain comfort when the temperature falls.\u003c\/p\u003e\n\u003cp\u003eIt works equally well for off-season fitness activities where sweat management and light warmth matter. The fabric stays comfortable next to skin and helps regulate temperature without overheating. A sleek design also makes it suitable for casual wear when you are off the track, giving you one versatile piece for multiple cold-weather needs.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this shirt FIA or SFI rated?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, this winter shirt is not fireproof or homologated. It is designed for comfort and performance in karting and other athletic activities in cold weather.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this under my kart suit during races?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. It fits comfortably under a kart suit and keeps you warm without overheating thanks to its breathable fabric.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the sizing run?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis shirt is designed to be form-fitting. If you are between sizes or prefer a looser fit, consider sizing up.\u003c\/p\u003e\n\u003cp\u003eCompare the OMP First Nomex Shirt for fire-resistant protection or the \u003ca href=\"\/products\/omp-ks-karting-long-sleeve-top\"\u003eOMP KS Karting Long Sleeve Top\u003c\/a\u003e for advanced Dryarn moisture management when you need different performance features. Both options from the same brand give you choices depending on whether you prioritize flame resistance or enhanced sweat evacuation in varying conditions.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/SIZE-CHART-UNDERLAYER-OMP-SIZE-CHART-IMAGE.png\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"8-10 years old","offer_id":54494328881470,"sku":"KE0-3021-B01-071-810Y","price":109.0,"currency_code":"USD","in_stock":false},{"title":"10-12 years old","offer_id":54494328914238,"sku":"KE0-3021-B01-071-1012Y","price":109.0,"currency_code":"USD","in_stock":false},{"title":"S\/M","offer_id":54494328947006,"sku":"KE0-3021-B01-071-SM","price":109.0,"currency_code":"USD","in_stock":true},{"title":"L\/XL","offer_id":54494328979774,"sku":"KE0-3021-B01-071-LXL","price":109.0,"currency_code":"USD","in_stock":true},{"title":"XXL","offer_id":54494329012542,"sku":"KE0-3021-B01-071-XXL","price":109.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-ks-winter-r-shirt-angled-front-image.jpg?v=1790144032"},{"product_id":"alpinestars-zx-evo-v2-underlayer-pants","title":"Alpinestars ZX EVO v2 Underlayer Pants","description":"\u003cp\u003eThe Alpinestars ZX EVO v2 Underlayer Pants are kart underwear engineered for uncompromising fire protection and comfort. Built with Lenzing FR fibers these FIA 8856-2018 homologated pants deliver exceptional flame resistance in a lightweight breathable and incredibly soft package. Designed to meet Formula 1 specification standards the ZX EVO v2 pants combine advanced protection with seamless comfort ensuring you stay focused on performance behind the wheel.\u003c\/p\u003e\u003cp\u003eThe pants are certified to the FIA 8856-2018 homologation standard for motorsport safety. They are constructed with Lenzing FR flame resistant natural viscose fiber for superior fire protection. The stretchable build is designed to meet the latest FIA homologation requirements. Seamless tubular construction reduces pressure points and maximizes comfort. The lightweight fabric keeps bulk low without compromising safety. A high percentage of Lenzing FR fibers enhances garment performance. They feature a jacquard motif with Alpinestars knee logo for a professional distinctive look. The soft touch finish improves comfort under a driving suit during long sessions.\u003c\/p\u003e\u003cp\u003eThe pants are ideal for professional and amateur drivers who need FIA 8856-2018 homologated fireproof underwear that balances comfort and performance. The stretchy low bulk design ensures they fit comfortably under any racing suit without restricting movement. The lightweight seamless tubular design prevents pressure points and ensures breathability during extended sessions.\u003c\/p\u003e\u003cp\u003eFor a different option developed for cold weather riding conditions with double density fabric covering the most exposed areas and comfortable moisture wicking material for optimal thermal protection see the \u003ca href=\"\/products\/alpinestars-ride-tech-winter-pants\"\u003eAlpinestars Ride Tech Winter Pants\u003c\/a\u003e. Those pants are made from polypropylene with elastane fabric that will not melt under abrasion and have tubular seamless construction and compression fit for muscle support to reduce fatigue whereas these ZX EVO v2 pants are constructed with Lenzing FR fibers and certified to the FIA 8856-2018 homologation standard.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Black \/ XS\/S","offer_id":54494428332350,"sku":"4755720-106-XSS","price":109.66,"currency_code":"USD","in_stock":false},{"title":"Black \/ M\/L","offer_id":54494428365118,"sku":"4755720-106-M\/L","price":109.66,"currency_code":"USD","in_stock":false},{"title":"Black \/ XL\/2XL","offer_id":54494428397886,"sku":"4755720-106-XXL","price":109.66,"currency_code":"USD","in_stock":true},{"title":"White \/ XS\/S","offer_id":54494428430654,"sku":"4755720-201-XSS","price":109.66,"currency_code":"USD","in_stock":false},{"title":"White \/ M\/L","offer_id":54494428463422,"sku":"4755720-201-M\/L","price":109.66,"currency_code":"USD","in_stock":false},{"title":"White \/ XL\/2XL","offer_id":54494428496190,"sku":"4755720-201-XXL","price":109.66,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/alpinestars-zx-evo-v2-pants-192726.jpg?v=1790144494"},{"product_id":"chillout-pro-sport-underlayer-shirt","title":"Chillout Pro Sport Underlayer Shirt","description":"\u003cp\u003eThe Chillout Pro Sport Underlayer Shirt delivers flame resistant thermal regulation for drivers who need consistent body temperature control and full homologation compliance during extended track sessions.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFIA Homologation Standard 8856 2018\u003c\/li\u003e\n\u003cli\u003eSFI Homologation Specification 3.3\u003c\/li\u003e\n\u003cli\u003eUltra lightweight fabric with built in airflow channels\u003c\/li\u003e\n\u003cli\u003eAntibacterial treatment that neutralizes 99 percent of bacteria\u003c\/li\u003e\n\u003cli\u003eThermal regulation that can lower skin temperature by up to 8 degrees F\u003c\/li\u003e\n\u003cli\u003eAvailable in black, charcoal, or white\u003c\/li\u003e\n\u003cli\u003eSizes XS through XXL\u003c\/li\u003e\n\u003cli\u003eComposition 42 percent M Aramide, 42 percent Viscose FR, 16 percent EA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eChoose a size that allows free movement without compression. The shirt must overlap the balaclava by at least 3 cm at the neck sides and 8 cm at the front center line. It must also overlap the bottom underlayer by a minimum of 7 cm at the waist. These overlaps maintain continuous protection at the neck, wrists, and ankles.\u003c\/p\u003e\n\u003cp\u003eLayer the shirt under a full suit that meets Appendix L requirements. Replace the garment at the first sign of wear or stretch.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eHomologation\u003c\/td\u003e\n\u003ctd\u003eFIA 8856 2018, SFI 3.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComposition\u003c\/td\u003e\n\u003ctd\u003e42 percent M Aramide, 42 percent Viscose FR, 16 percent EA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSizes\u003c\/td\u003e\n\u003ctd\u003eXS to XXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColors\u003c\/td\u003e\n\u003ctd\u003eBlack, charcoal, white\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow should I wash the shirt?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFollow the care label instructions exactly. Avoid prolonged direct sunlight to prevent color fade and material aging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I wear it alone?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It must be paired with additional protective layers that cover the neck, wrists, and ankles as required by sanctioning body rules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I replace it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eReplace immediately if the fabric shows wear, stretch, or damage.\u003c\/p\u003e\n\u003cp\u003eDrivers seeking a winter focused base layer may also consider the \u003ca href=\"\/products\/alpinestars-ride-tech-winter-shirt\"\u003eAlpinestars Ride Tech Winter Shirt\u003c\/a\u003e for added insulation or the \u003ca href=\"\/products\/omp-first-nomex-shirt\"\u003eOMP First Nomex Shirt\u003c\/a\u003e for a different Nomex construction. Those racing in cooler kart conditions can compare the \u003ca href=\"\/products\/omp-karting-winter-shirt\"\u003eOMP Karting Winter Shirt\u003c\/a\u003e for seamless thermal performance.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Black \/ XS","offer_id":54494478106942,"sku":"COPSTPBKXS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ S","offer_id":54494478139710,"sku":"COPSTPBKS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ M","offer_id":54494478172478,"sku":"COPSTPBKM","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ L","offer_id":54494478205246,"sku":"COPSTPBKL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL","offer_id":54494478238014,"sku":"COPSTPBKXL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XXL","offer_id":54494478270782,"sku":"COPSTPBKXXL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Charcoal \/ XS","offer_id":54494478303550,"sku":"COPSTPCHXS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Charcoal \/ S","offer_id":54494478336318,"sku":"COPSTPCHS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Charcoal \/ M","offer_id":54494478369086,"sku":"COPSTPCHM","price":215.0,"currency_code":"USD","in_stock":true},{"title":"Charcoal \/ L","offer_id":54494478401854,"sku":"COPSTPCHL","price":215.0,"currency_code":"USD","in_stock":false},{"title":"Charcoal \/ XL","offer_id":54494478434622,"sku":"COPSTPCHXL","price":215.0,"currency_code":"USD","in_stock":false},{"title":"Charcoal \/ XXL","offer_id":54494478467390,"sku":"COPSTPCHXXL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XS","offer_id":54494478500158,"sku":"COPSTPWTXS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"White \/ S","offer_id":54494478532926,"sku":"COPSTPWTS","price":215.0,"currency_code":"USD","in_stock":true},{"title":"White \/ M","offer_id":54494478565694,"sku":"COPSTPWTM","price":215.0,"currency_code":"USD","in_stock":false},{"title":"White \/ L","offer_id":54494478598462,"sku":"COPSTPWTL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XL","offer_id":54494478631230,"sku":"COPSTPWTXL","price":215.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XXL","offer_id":54494478663998,"sku":"COPSTPWTXXL","price":215.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/Chill_Out_Pro_Sport_Underlayer_SHirt_Top_Charcoal_Front_Image_bc0fb426-e757-45e3-ba4e-5a6f908173a9.png?v=1790145260"},{"product_id":"omp-first-nomex-shirt","title":"OMP First Nomex Shirt","description":"\u003cp\u003eThe OMP First Nomex Shirt is a premium entry-level racing underlayer designed to provide drivers with essential fire-resistant protection while maximizing comfort and performance. Constructed from high-quality flame-retardant Nomex material, this top ensures superior safety in demanding conditions. The lightweight breathable fabric offers excellent moisture-wicking properties that keep drivers cool and dry during intense sessions. With a regular ergonomic fit the shirt reduces bulk under race suits and allows full freedom of movement, making it suitable for both professional and amateur drivers who compete in 4 cycle racing.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFIA 8856-2018 homologated\u003c\/li\u003e\n\u003cli\u003eSFI 3.3 homologated\u003c\/li\u003e\n\u003cli\u003eLightweight moisture-wicking Nomex fabric\u003c\/li\u003e\n\u003cli\u003eFlat seams\u003c\/li\u003e\n\u003cli\u003eShaped neck\u003c\/li\u003e\n\u003cli\u003eRaglan sleeves\u003c\/li\u003e\n\u003cli\u003eRegular ergonomic fit\u003c\/li\u003e\n\u003cli\u003eBlack or white\u003c\/li\u003e\n\u003cli\u003eSizes small through 2XL\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThe regular fit reduces bulk under a kart suit or FIA suit while allowing full freedom of movement during long sessions. Flat seams and raglan sleeves improve comfort against the skin, and the breathable Nomex keeps moisture away so drivers stay dry and focused. This top layers cleanly with other OMP fire resistant underwear and racewear for complete coverage on track days or race weekends.\u003c\/p\u003e\u003cp\u003eDesigned as part of the First Collection, the shirt combines advanced safety technology with a budget-friendly price point and works well for both everyday practice and higher level competition.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this shirt suitable for karting?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, it works as a fire rated underlayer for 4 cycle kart suits on LO206 weekends.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat colors and sizes are offered?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlack or white in sizes small through 2XL.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it meet safety standards?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt carries both FIA 8856-2018 and SFI 3.3 homologation.\u003c\/p\u003e\u003cp\u003eFor colder conditions consider the \u003ca href=\"\/products\/omp-karting-winter-shirt\"\u003eOMP Karting Winter Shirt\u003c\/a\u003e which adds thermal performance through a seamless weave that traps warmth without bulk, or the \u003ca href=\"\/products\/omp-ks-karting-long-sleeve-top\"\u003eOMP KS Karting Long Sleeve Top\u003c\/a\u003e which uses Dryarn fiber and a 3D knit structure for rapid sweat evacuation.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/OMPunderlayersizingchart2026.jpg\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Black \/ Small","offer_id":54494479221054,"sku":"IE0-0771-A01-071-S","price":159.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium","offer_id":54494479253822,"sku":"IE0-0771-A01-071-M","price":159.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Large","offer_id":54494479286590,"sku":"IE0-0771-A01-071-L","price":159.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Extra Large","offer_id":54494479319358,"sku":"IE0-0771-A01-071-XL","price":159.0,"currency_code":"USD","in_stock":false},{"title":"Black \/ 2X Large","offer_id":54494479352126,"sku":"IE0-0771-A01-071-XXL","price":159.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Small","offer_id":54494479384894,"sku":"IE0-0771-A01-020-S","price":159.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Medium","offer_id":54494479417662,"sku":"IE0-0771-A01-020-M","price":159.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Large","offer_id":54494479450430,"sku":"IE0-0771-A01-020-L","price":159.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Extra Large","offer_id":54494479483198,"sku":"IE0-0771-A01-020-XL","price":159.0,"currency_code":"USD","in_stock":true},{"title":"White \/ 2X Large","offer_id":54494479515966,"sku":"IE0-0771-A01-020-XXL","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-first-nomex-shirt-238538.jpg?v=1790145275"},{"product_id":"omp-first-nomex-pants","title":"OMP First Nomex Pants","description":"\u003cp\u003eThe OMP First Nomex Pants are entry level fire retardant underlayer pants built for drivers in 4 cycle racing who need reliable protection under a race suit without added bulk. These pants deliver essential fire resistant performance while supporting comfort during extended track time.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFIA 8856 2018 homologated\u003c\/li\u003e\n\u003cli\u003eSFI 3.3 homologated\u003c\/li\u003e\n\u003cli\u003eLightweight Nomex moisture wicking fabric\u003c\/li\u003e\n\u003cli\u003eFlat seams\u003c\/li\u003e\n\u003cli\u003eTight ankle cuffs\u003c\/li\u003e\n\u003cli\u003eElastic waistband\u003c\/li\u003e\n\u003cli\u003eRegular ergonomic fit\u003c\/li\u003e\n\u003cli\u003ePart of the OMP First collection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eThe regular fit sits close to the body and reduces bulk under outer layers so drivers maintain full range of motion during long sessions. The fabric wicks moisture to help keep skin dry while the flat seams limit irritation points at the ankles and waist. Elastic at the waist and tight cuffs help the pants stay in place without shifting under a suit.\u003c\/p\u003e\n\u003cp\u003eThese pants pair with other OMP fire resistant layers and are suited for repeated use in 4 cycle racing environments where basic fire protection and comfort matter most. The ergonomic design supports freedom of movement so drivers can focus on performance rather than adjusting layers mid session.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these pants machine washable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFollow the care instructions on the garment tag to preserve the Nomex properties.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan they be worn alone?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, they are designed strictly as an underlayer beneath a fire rated race suit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo they stretch over time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe elastic waist and fabric construction maintain shape with normal use and proper care.\u003c\/p\u003e\n\u003cp\u003eCompare with the \u003ca href=\"\/products\/omp-karting-ks-winter-r-pants\"\u003eOMP Karting KS Winter-R Pants\u003c\/a\u003e for added thermal stretch in cold conditions, the \u003ca href=\"\/products\/omp-one-evo-nomex-pants\"\u003eOMP ONE EVO Nomex Pants\u003c\/a\u003e for seamless 3D cube cooling inserts, or the \u003ca href=\"\/products\/omp-karting-underwear-short-sleeve\"\u003eOMP Karting Underwear Short Sleeve\u003c\/a\u003e for a matching upper layer option.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/OMPunderlayersizingchart2026.jpg\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Black \/ Small","offer_id":54494479679806,"sku":"IAA\/772071S","price":129.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium","offer_id":54494479712574,"sku":"IAA\/772071M","price":129.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Large","offer_id":54494479745342,"sku":"IAA\/772071L","price":129.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL","offer_id":54494479778110,"sku":"IAA\/772071XL","price":129.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XXL","offer_id":54494479810878,"sku":"IAA\/772071XXL","price":129.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Small","offer_id":54494479843646,"sku":"IAA\/772020S","price":129.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Medium","offer_id":54494479876414,"sku":"IAA\/772020M","price":129.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Large","offer_id":54494479909182,"sku":"IAA\/772020L","price":129.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XL","offer_id":54494479941950,"sku":"IAA\/772020XL","price":129.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XXL","offer_id":54494479974718,"sku":"IAA\/772020XXL","price":129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-first-nomex-pants-442053.jpg?v=1790145284"},{"product_id":"omp-one-evo-nomex-pants","title":"OMP ONE EVO Nomex Pants","description":"\u003cp\u003eThe OMP ONE EVO Nomex Pants are top of the line fire retardant underwear pants made with comfortable seamless fabric for karting drivers in 4 cycle racing who need lightweight protection and cooling under a fire suit during long sessions.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFIA 8856-2018 Homologation\u003c\/li\u003e\n\u003cli\u003eOMP Dry System aligning cooling panels of underlayers and ONE or Tecnica Evo fire suits\u003c\/li\u003e\n\u003cli\u003e3D cube inserts on high perspiration areas\u003c\/li\u003e\n\u003cli\u003eUltra flat anti rubbing seams throughout\u003c\/li\u003e\n\u003cli\u003eSingle smooth layer of aramidic fabric for ultra lightweight comfort\u003c\/li\u003e\n\u003cli\u003eSlim athletic cut\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThe slim athletic cut allows a smooth comfortable fit under your fire suit and improves moisture wicking to keep you dry and cool. Ultra flat seams reduce rubbing during long stints while the seamless construction adds to overall comfort.\u003c\/p\u003e\u003cp\u003eHigh breathability 3D cube inserts align with matching panels in OMP ONE and Tecnica Evo suits to complete the Dry System for maximum cooling regardless of heat. The pants are designed as a fire rated underlayer for Briggs LO206 use and work as part of the OMP Dry System to optimize body cooling through strategic placement on main perspiration zones.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this suitable for hot weather racing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes the high breathability 3D cube inserts and Dry System technology optimize body cooling regardless of the heat while the ultra lightweight fabric keeps you comfortable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat standard does it meet?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is updated to meet the latest FIA 8856-2018 standard and features homologation for fire retardant performance in demanding conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it pair with suits?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt aligns with OMP ONE and Tecnica Evo lines of fire suits for maximum cooling through matching breathable inserts that form the complete OMP Dry System.\u003c\/p\u003e\u003cp\u003eFor a more basic option consider the \u003ca href=\"\/products\/omp-first-nomex-pants\"\u003eOMP First Nomex Pants\u003c\/a\u003e which offers a premium entry level design with regular ergonomic fit and lightweight breathable fabric. The \u003ca href=\"\/products\/omp-karting-ks-winter-r-pants\"\u003eOMP Karting KS Winter-R Pants\u003c\/a\u003e add thermal stretch fabric for cold weather winter karting while preserving mobility. The \u003ca href=\"\/products\/omp-karting-underwear-short-sleeve\"\u003eOMP Karting Underwear Short Sleeve\u003c\/a\u003e provides a matching top layer with Dryarn fiber technology for strategic breathability and moisture management in four color options.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/OMPunderlayersizingchart2026.jpg\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"Black \/ Extra Small\/Small","offer_id":54494480007486,"sku":"IE0-0793-A01-071-XSS","price":239.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium","offer_id":54494480040254,"sku":"IE0-0793-A01-071-M","price":239.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Large","offer_id":54494480073022,"sku":"IE0-0793-A01-071-L","price":239.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL\/2XL","offer_id":54494480105790,"sku":"IE0-0793-A01-071-XLXXL","price":239.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Extra Small\/Small","offer_id":54494480138558,"sku":"IE0-0793-A01-020-XSS","price":239.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Medium","offer_id":54494480171326,"sku":"IE0-0793-A01-020-M","price":239.0,"currency_code":"USD","in_stock":true},{"title":"White \/ Large","offer_id":54494480204094,"sku":"IE0-0793-A01-020-L","price":239.0,"currency_code":"USD","in_stock":true},{"title":"White \/ XL\/2XL","offer_id":54494480236862,"sku":"IE0-0793-A01-020-XLXXL","price":239.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-one-evo-nomex-pants-943931.jpg?v=1790145286"},{"product_id":"omp-karting-underwear-short-sleeve","title":"OMP Karting Underwear Short Sleeve","description":"\u003cp\u003eThe OMP Karting Underwear Short Sleeve Shirt is a high performance base layer built for intense karting sessions. It combines lightweight insulation, strategic breathability, and Dryarn fiber technology to keep you dry, cool, and focused in the heat of competition. This short sleeve top suits drivers who race in warm conditions and need reliable moisture control under their suit during extended track time in 4 cycle racing.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDryarn high performance microfiber that is lighter than polyester and more breathable than cotton\u003c\/li\u003e\n\u003cli\u003e3D seamless construction with knitting zones that support sweat evacuation and reduce friction points\u003c\/li\u003e\n\u003cli\u003eShort sleeve cut for greater airflow while maintaining core insulation\u003c\/li\u003e\n\u003cli\u003eAvailable in White, Black, Orange, or Blue\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eThis short sleeve top is designed for summer karting sessions where heat and exertion are high. The seamless knit eliminates pressure points under a suit while the Dryarn fiber wicks moisture to keep the body dry and thermally balanced. It serves as an ideal summer underlayer that promotes airflow without sacrificing core coverage during long runs on the track.\u003c\/p\u003e\n\u003cp\u003eWear it as a summer underlayer under a 4 cycle kart suit for extended track time without added bulk or irritation. The construction supports sweat evacuation so you stay comfortable lap after lap even when temperatures rise.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this shirt fireproof?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003eNo. It is intended for karting and athletic use where comfort and moisture control are the priority.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be worn under a racing suit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003eYes. It functions as a lightweight base layer especially suited to warm conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does Dryarn perform?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003eIt regulates body temperature and moves moisture away from the skin more efficiently than many traditional base layer fabrics.\u003c\/p\u003e\n\u003cp\u003ePair this top with the \u003ca href=\"\/products\/omp-karting-underwear-shorts\"\u003eOMP Karting Underwear Shorts\u003c\/a\u003e for matching Dryarn coverage, the \u003ca href=\"\/products\/omp-first-nomex-pants\"\u003eOMP First Nomex Pants\u003c\/a\u003e when fire resistant protection is required, or the \u003ca href=\"\/products\/omp-karting-ks-winter-r-pants\"\u003eOMP Karting KS Winter-R Pants\u003c\/a\u003e for colder weather.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"8-10 Years (Child) \/ White","offer_id":54494481416510,"sku":"KE0-3030-A01-020-810Y","price":95.0,"currency_code":"USD","in_stock":false},{"title":"8-10 Years (Child) \/ Celeste Blue","offer_id":54494481449278,"sku":"KE0-3030-A01-041-810Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"8-10 Years (Child) \/ Orange","offer_id":54494481482046,"sku":"KE0-3030-A01-090-810Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"8-10 Years (Child) \/ Black","offer_id":54494481514814,"sku":"KE0-3030-A01-071-810Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"10-12 Years (Child) \/ White","offer_id":54494481547582,"sku":"KE0-3030-A01-020-1012Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"10-12 Years (Child) \/ Celeste Blue","offer_id":54494481580350,"sku":"KE0-3030-A01-041-1012Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"10-12 Years (Child) \/ Orange","offer_id":54494481613118,"sku":"KE0-3030-A01-090-1012Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"10-12 Years (Child) \/ Black","offer_id":54494481645886,"sku":"KE0-3030-A01-071-1012Y","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XXS \/ White","offer_id":54494481678654,"sku":"KE0-3030-A01-020-XSS","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XXS \/ Celeste Blue","offer_id":54494481711422,"sku":"KE0-3030-A01-041-XSS","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XXS \/ Orange","offer_id":54494481744190,"sku":"KE0-3030-A01-090-XSS","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XXS \/ Black","offer_id":54494481776958,"sku":"KE0-3030-A01-071-XSS","price":95.0,"currency_code":"USD","in_stock":true},{"title":"Medium\/Large\/ \/ White","offer_id":54494481809726,"sku":"KE0-3030-A01-020-ML","price":95.0,"currency_code":"USD","in_stock":true},{"title":"Medium\/Large\/ \/ Celeste Blue","offer_id":54494481842494,"sku":"KE0-3030-A01-041-ML","price":95.0,"currency_code":"USD","in_stock":true},{"title":"Medium\/Large\/ \/ Orange","offer_id":54494481875262,"sku":"KE0-3030-A01-090-ML","price":95.0,"currency_code":"USD","in_stock":true},{"title":"Medium\/Large\/ \/ Black","offer_id":54494481908030,"sku":"KE0-3030-A01-071-ML","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XL\/XXL \/ White","offer_id":54494481940798,"sku":"KE0-3030-A01-020-XLXXL","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XL\/XXL \/ Celeste Blue","offer_id":54494481973566,"sku":"KE0-3030-A01-041-XLXXL","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XL\/XXL \/ Orange","offer_id":54494482006334,"sku":"KE0-3030-A01-090-XLXXL","price":95.0,"currency_code":"USD","in_stock":true},{"title":"XL\/XXL \/ Black","offer_id":54494482039102,"sku":"KE0-3030-A01-071-XLXXL","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-karting-underwear-short-sleeve-blue-image.jpg?v=1790145314"},{"product_id":"omp-karting-ks-winter-r-pants","title":"OMP Karting KS Winter-R Pants","description":"\u003cp\u003eThe OMP Karting KS Winter-R Pants are long johns built as a winter underlayer for 4 cycle racing. They suit drivers who need to stay warm and mobile during cold track sessions without added bulk. These high performance pants use advanced seamless technology to deliver superior breathability and flexibility so you remain comfortable even when temperatures drop. The design helps you maintain full range of motion while keeping muscles ready for action on the track or during other outdoor activities.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThermal stretch fabric\u003c\/li\u003e\n\u003cli\u003e3D seamless construction\u003c\/li\u003e\n\u003cli\u003eDeveloped with kart teams\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFit and use\u003c\/h2\u003e\u003cp\u003eThe pants layer directly under a kart suit. The stretch fabric keeps muscles warm while the seamless build moves moisture away to reduce chill during high effort runs. This combination supports consistent performance by preserving freedom of movement and eliminating pressure points that could distract during extended sessions.\u003c\/p\u003e\u003cp\u003eThey also work for other cold weather activities that require freedom of movement such as skiing or cycling. The ergonomic fit developed with professional input ensures the pants stay in place without bunching so you can focus on your activity rather than adjusting layers.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre the KS Winter R Pants flame resistant?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. These pants are designed for karting and general winter sports use. They are not FIA or SFI homologated and should not be used as fireproof base layers in auto racing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo these pants help regulate body temperature?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The Dryarn based seamless construction wicks sweat efficiently and insulates the lower body making them ideal for cold conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I wear these under a regular kart suit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAbsolutely. These are sized to fit under karting suits without bunching and the soft weave reduces friction for all day comfort.\u003c\/p\u003e\u003cp\u003eCompare with the \u003ca href=\"\/products\/omp-first-nomex-pants\"\u003eOMP First Nomex Pants\u003c\/a\u003e which add flame resistance the \u003ca href=\"\/products\/omp-one-evo-nomex-pants\"\u003eOMP ONE EVO Nomex Pants\u003c\/a\u003e which add fire retardant seamless fabric or the \u003ca href=\"\/products\/omp-karting-underwear-short-sleeve\"\u003eOMP Karting Underwear Short Sleeve\u003c\/a\u003e which offers a short sleeve top option for matching base layers in varying conditions.\u003c\/p\u003e\u003ch2\u003eSizing\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0647\/9242\/8763\/files\/OMPunderlayersizingchart2026.jpg\" alt=\"Sizing chart\"\u003e\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"S\/M","offer_id":54494482235710,"sku":"KE0-3022-B01-071-SM","price":89.0,"currency_code":"USD","in_stock":true},{"title":"L\/XL","offer_id":54494482268478,"sku":"KE0-3022-B01-071-LXL","price":89.0,"currency_code":"USD","in_stock":true},{"title":"XXL","offer_id":54494482301246,"sku":"KE0-3022-B01-071-XXL","price":89.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-ks-winter-r-pants-black-front-image.jpg?v=1790145320"},{"product_id":"omp-karting-underwear-shorts","title":"OMP Karting Underwear Shorts","description":"\u003cp\u003eThe OMP Karting Underwear Shorts are a lightweight base layer designed for kart racers who need reliable moisture control during long sessions on the track.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight Dryarn polypropylene fiber construction\u003c\/li\u003e\n\u003cli\u003eSeamless 3D knit for anatomical fit\u003c\/li\u003e\n\u003cli\u003eAdvanced moisture control that expels sweat rapidly\u003c\/li\u003e\n\u003cli\u003eYouth sizes for ages 8 to 10 and 10 to 12\u003c\/li\u003e\n\u003cli\u003eAdult sizes from XSS through XXL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eThese shorts sit smoothly under a kart suit without adding bulk or creating pressure points. The seamless design moves with the body through repeated steering inputs and seat shifts while the Dryarn fabric handles heat and perspiration to keep the driver focused.\u003c\/p\u003e\n\u003cp\u003eThey suit 4 cycle racing environments where breathability matters more than fire resistance. The shorts are not fire retardant and are intended only for karting use.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these shorts fireproof?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. These karting underwear shorts are not fire retardant and are not intended for auto racing. They are ideal for karting and non FIA applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I wear them with a standard kart suit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. These are specifically designed to fit comfortably under karting suits without bulk or discomfort.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the benefit of Dryarn over cotton?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDryarn is more breathable, faster drying, and better at thermal regulation than cotton, keeping you cooler and more focused.\u003c\/p\u003e\n\u003cp\u003ePair these shorts with the \u003ca href=\"\/products\/omp-karting-underwear-short-sleeve\"\u003eOMP Karting Underwear Short Sleeve\u003c\/a\u003e for a matching top layer, the \u003ca href=\"\/products\/omp-first-nomex-pants\"\u003eOMP First Nomex Pants\u003c\/a\u003e when fire resistant underlayers are required, or the \u003ca href=\"\/products\/omp-karting-ks-winter-r-pants\"\u003eOMP Karting KS Winter R Pants\u003c\/a\u003e for colder conditions.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"8-10 Years (Child)","offer_id":54494482596158,"sku":"KE0-3031-A01-020-810Y","price":65.0,"currency_code":"USD","in_stock":true},{"title":"10-12 Years (Child)","offer_id":54494482628926,"sku":"KE0-3031-A01-020-1012Y","price":65.0,"currency_code":"USD","in_stock":true},{"title":"XXS\/Small","offer_id":54494482661694,"sku":"KE0-3031-A01-020-XSS","price":65.0,"currency_code":"USD","in_stock":true},{"title":"Medium\/Large","offer_id":54494482694462,"sku":"KE0-3031-A01-020-ML","price":65.0,"currency_code":"USD","in_stock":false},{"title":"XL\/XXL","offer_id":54494482727230,"sku":"KE0-3031-A01-020-XLXXL","price":65.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/omp-karting-underwear-shorts-white-front-image2.jpg?v=1790145322"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/omp-ks-winter-r-shirt-angled-front-image.jpg?v=1790669068","url":"https:\/\/swiftkarting.com\/collections\/kart-racing-underlayers.oembed","provider":"Swift Karting","version":"1.0","type":"link"}