Simpson Carbon-X Fire Resistant Racing Underpants - SFI 3.3

Maximize your track safety by pairing your SFI-rated suit with CarbonX fire-retardant racing underwear. Engineered for superior protection and all-day comfort, this essential base layer features built-in moisture-wicking properties to keep you cool under pressure. The advanced CarbonX material is inherently flame-resistant—guaranteed never to burn, melt, or ignite when exposed to direct flame. Available exclusively in black, it delivers the ultimate combination of reliable defense and performance.