Underwear PRO-TX Bottom White Large SFI 3.3

The BELL HELMETS Underwear PRO-TX Bottom White Large SFI 3.3 is a professional-grade fire-retardant base layer engineered for motorsports, racing, and high-heat environments where driver safety is non-negotiable. Designed to meet SFI Foundation 3.3 certification standards, this bottom layer provides essential thermal protection and flame resistance for drivers, pit crew, and safety personnel operating in vehicles or near open flames. The lightweight construction ensures comfort during extended wear while maintaining critical protective capabilities.

Constructed from a specialized fire-retardant blend fabric, the PRO-TX bottom delivers reliable flame resistance without compromising breathability or mobility. The SFI 3.3 rating confirms this garment meets rigorous flammability standards tested by independent laboratories, making it compliant with sanctioning bodies across motorsports disciplines. The white colorway aids in heat reflection and visibility, while the tailored large sizing ensures proper fit under protective suits. At just 0.21 lbs, the garment maintains minimal weight burden, critical for drivers who must maintain peak performance and situational awareness for extended periods.

This underwear bottom is ideal for circuit racers, drag racers, rally competitors, and professional drivers who require sanctioning-body-approved protective wear. It pairs seamlessly with matching SFI-certified upper layers and race suits to create a complete fire-resistant system. Maintenance is straightforward—follow standard garment care instructions while preserving the fire-retardant treatment. Whether you're preparing for organized competition or professional driving duties, the PRO-TX bottom provides dependable protection backed by proven certification standards and Bell Helmets' legacy in motorsports safety.