Underwear Top SPORT-TX Black Medium SFI 3.3

The BELL Underwear Top SPORT-TX Black Medium SFI 3.3 is a professional-grade fire-retardant base layer engineered for high-performance driving environments where thermal protection is non-negotiable. Designed for motorsports competitors, track day drivers, and serious automotive enthusiasts, this long-sleeve crew neck garment serves as the critical foundation layer beneath a racing suit or nomex oversuit. SFI 3.3 certification ensures compliance with international racing safety standards, making it essential equipment for sanctioned events and professional driving applications.

This underwear top is constructed from a fire-retardant blend fabric that provides consistent thermal barrier protection without compromising breathability during intense driving sessions. The long-sleeve design and crew neck configuration maximize coverage and work in concert with racing suits to create a complete protective system. Weighing just 0.6 lbs, the garment is lightweight enough to eliminate bulk under competition gear while maintaining the durability required for repeated high-heat exposure. The black colorway is standard across professional racing contexts and helps manage heat absorption when layered with outer protective equipment.

Anyone participating in sanctioned motorsports—whether drag racing, road course competition, or circuit racing—will benefit from SFI 3.3-certified base layers as mandatory safety equipment. The Medium size accommodates standard adult frame dimensions while ensuring the layering fit necessary for unrestricted movement and proper heat management. This underwear top integrates seamlessly with most race suits and nomex gear combinations, making it the go-to choice for drivers who demand verified safety certification and proven thermal performance in competition environments.