Underwear Bottom SPORT- TX White Small SFI 3.3

The Underwear Bottom SPORT-TX White Small SFI 3.3 by Bell Helmets is a dedicated fire-retardant base layer engineered for high-performance motorsports, racing, and tactical applications where thermal protection is non-negotiable. Designed to be worn as a standalone garment or layered beneath heavy outer wear, this racing underwear bottom meets SFI Foundation 3.3 certification standards, making it compliant with professional racing regulations and safety requirements. Athletes, professional drivers, and motorsports enthusiasts rely on fire-resistant base layers like this to maintain core comfort while ensuring critical protection against heat and flame exposure.

Constructed from a fire-retardant blend fabric, the SPORT-TX bottom combines breathability with thermal barrier properties, allowing moisture wicking while maintaining the material's inherent flame-resistant characteristics. The SFI 3.3 rating confirms this garment has undergone rigorous testing for heat resistance and flame performance, ensuring it will not ignite, melt, or shrink excessively when exposed to direct flame or high-temperature environments. The white colorway offers visibility and helps reflect heat, while the small sizing ensures a snug, non-restrictive fit that allows full range of motion during intense physical activity. Lightweight at 0.6 lbs, this base layer adds minimal bulk while delivering maximum safety compliance.

This product is ideal for competitive racers, rally drivers, autocross participants, and motorsports professionals who operate in environments where SFI-rated protective gear is mandatory or strongly recommended. The SPORT-TX bottom pairs seamlessly with matching fire-retardant tops and outer racing suits, creating a complete protective ensemble. Whether you're preparing for sanctioned racing events, high-performance driving schools, or professional motorsports competition, this Bell Helmets base layer provides the certified protection and performance you need when safety standards cannot be compromised. Always verify that your complete racing suit meets your specific event or organizational requirements.