Chillout Pro Sport Underlayer Shirt

The 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.

What you get

• FIA Homologation Standard 8856 2018
• SFI Homologation Specification 3.3
• Ultra lightweight fabric with built in airflow channels
• Antibacterial treatment that neutralizes 99 percent of bacteria
• Thermal regulation that can lower skin temperature by up to 8 degrees F
• Available in black, charcoal, or white
• Sizes XS through XXL
• Composition 42 percent M Aramide, 42 percent Viscose FR, 16 percent EA

Fit and use

Choose 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.

Layer the shirt under a full suit that meets Appendix L requirements. Replace the garment at the first sign of wear or stretch.

Specs

FAQ

How should I wash the shirt?

Follow the care label instructions exactly. Avoid prolonged direct sunlight to prevent color fade and material aging.

Can I wear it alone?

No. It must be paired with additional protective layers that cover the neck, wrists, and ankles as required by sanctioning body rules.

When should I replace it?

Replace immediately if the fabric shows wear, stretch, or damage.

Drivers seeking a winter focused base layer may also consider the Alpinestars Ride Tech Winter Shirt for added insulation or the OMP First Nomex Shirt for a different Nomex construction. Those racing in cooler kart conditions can compare the OMP Karting Winter Shirt for seamless thermal performance.