Underwear Top SPORT-TX White Medium SFI 3.3

The Underwear Top SPORT-TX White Medium SFI 3.3 by Bell Helmets is a specialized racing base layer engineered for drivers and motorsports enthusiasts who demand professional-grade thermal protection and fire resistance. Whether you're campaigning a street-legal performance build, competing in road racing events, or logging serious track time, this undergarment serves as a critical safety layer beneath your racing suit. SFI certification ensures it meets the stringent safety standards recognized across sanctioning bodies, making it an essential investment for anyone serious about driver protection and compliance.

Constructed with advanced SPORT-TX fabric technology, this racing underwear top delivers multi-layer thermal management and flame-resistant properties that protect skin in high-heat cockpit environments or in the event of a fuel system incident. The medium size fits comfortably under racing suits without bulk, allowing unrestricted movement during aggressive driving maneuvers while maintaining consistent contact with your torso for optimal heat distribution and protection. The white colorway minimizes light absorption and helps regulate core temperature during extended driving sessions—a detail that experienced mechanics and drivers recognize as functionally significant in closed-cockpit racing applications where ventilation is limited.

This base layer pairs seamlessly with any full racing suit and is compatible with all IMSA, SCCA, and club-level road racing programs. Drivers preparing vintage racers, modern GT builds, or dedicated track machines will find the Underwear Top SPORT-TX essential for meeting technical inspection requirements. At 1.26 lbs, the minimal weight penalty makes it practical for long endurance events where every gram of comfort and protection counts—professional and amateur racers alike depend on Bell's fire-resistant base layers as non-negotiable safety infrastructure for serious motorsport competition.