Carbon X Underwear Top Medium Long Sleeve

The Carbon X Underwear Top Medium Long Sleeve from Simpson Safety is engineered as a foundational fire-resistant layer for drivers and motorsports professionals who demand maximum thermal and flame protection during high-performance driving, racing, or any automotive application where heat exposure is a genuine risk. This SFI 3.3-certified base layer sits beneath your racing suit or driver gear, creating a critical barrier between your skin and potential ignition sources—whether you're tackling extended track sessions, working in high-temperature engine compartments, or competing in sanctioned motorsports events where safety certification is non-negotiable.

Constructed from advanced CarbonX material, this long-sleeve crewneck top delivers proven flame-resistance without sacrificing breathability or comfort during extended wear. CarbonX fabric maintains its protective properties through repeated washing and exposure to harsh automotive environments, resisting degradation from oils, coolants, and fuel contact that would compromise synthetic alternatives. The medium sizing and measured dimensions (11.05 x 2.65 x 15 inches) ensure a fitted profile that layers seamlessly under racing suits, flight suits, or heavy protective gear without bunching, while the lightweight 0.95 lb construction minimizes added heat stress during intense driving sessions where every degree of comfort impacts focus and safety.

Professional drivers, pit crew members, and serious automotive enthusiasts select this Carbon X Underwear Top as insurance against the unpredictable—a proven layer that works silently until it's needed, meeting SFI 3.3 standards required by most sanctioning bodies and insurance protocols. Use it as your baseline protection when suiting up for track duty, autocross events, or any high-heat automotive work environment where compliance and confidence matter equally.