{"product_id":"sparco-rw-4-nomex-socks","title":"Sparco RW-4 Nomex Socks","description":"\u003cp\u003eThe Sparco RW-4 Nomex Socks deliver mid-calf fire protection for drivers in 4 cycle racing who need reliable underlayer coverage without added bulk. The Sparco RW-4 line of undergarments is designed to provide both comfort and protection through its signature soft-touch interlock fabric. These mid-calf socks bring that same fabric to the feet, resulting in lightweight breathable coverage that stays comfortable during long sessions on track.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSoft-touch interlock Nomex fabric\u003c\/li\u003e\n\u003cli\u003eLightweight and breathable construction\u003c\/li\u003e\n\u003cli\u003eFire-retardant and anti-static properties\u003c\/li\u003e\n\u003cli\u003eRegular fit mid-calf length\u003c\/li\u003e\n\u003cli\u003eFIA 8856-2018 approved\u003c\/li\u003e\n\u003cli\u003eEuropean shoe sizing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFit and use\u003c\/h2\u003e\n\u003cp\u003eThese socks sit comfortably under racing boots and maintain their shape through repeated wear and washing. The interlock knit reduces pressure points while the Nomex layer meets required safety standards for kart use. Because the fabric is both soft and breathable, the socks help manage moisture and temperature inside the boot without adding bulk or stiffness.\u003c\/p\u003e\n\u003cp\u003eEuropean sizing runs true to chart; select your normal European shoe size for the best regular fit. No special break-in is needed. The regular fit allows the socks to slide on easily yet stay in place once the boots are secured, supporting consistent contact with the pedals throughout a session.\u003c\/p\u003e\n\u003cp\u003eThe manufacturer part number 001516BI identifies this exact model within the RW-4 range. The combination of fire-retardant Nomex and anti-static properties gives the socks their core protective function while the soft interlock texture keeps them pleasant against the skin for extended periods.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these socks machine washable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, they can be laundered following the care instructions on the label to preserve fire-retardant performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo they provide full fire protection on their own?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThey form one layer of a complete fire-rated undergarment system and must be worn with matching approved top layers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do they compare to other Sparco socks?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe RW-4 uses the classic soft interlock Nomex while the \u003ca href=\"\/products\/sparco-gulf-socks\"\u003eSparco Gulf Socks\u003c\/a\u003e add a Gulf colorway and the \u003ca href=\"\/products\/sparco-rw-10-compression-nomex-socks\"\u003eSparco RW-10 Compression Nomex Socks\u003c\/a\u003e add X-Cool cooling treatment and a seamless compression fit.\u003c\/p\u003e","brand":"Competition Motorsport","offers":[{"title":"38\/39","offer_id":54494366269758,"sku":"001516BI1012","price":59.0,"currency_code":"USD","in_stock":true},{"title":"40\/41","offer_id":54494366302526,"sku":"001516BI11","price":59.0,"currency_code":"USD","in_stock":true},{"title":"42\/43","offer_id":54494366335294,"sku":"001516BI1112","price":59.0,"currency_code":"USD","in_stock":true},{"title":"44\/45","offer_id":54494366368062,"sku":"001516BI12","price":59.0,"currency_code":"USD","in_stock":true},{"title":"46","offer_id":54494366400830,"sku":"001516BI1212","price":59.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/sparco-RW-4-nomex-sock.jpg?v=1790144213","url":"https:\/\/swiftkarting.com\/products\/sparco-rw-4-nomex-socks","provider":"Swift Karting","version":"1.0","type":"link"}