Underwear Bottom FR Black X-Small SFI 3.3

The Underwear Bottom FR Black X-Small SFI 3.3 by RaceQuip is a professional-grade fire-resistant base layer engineered for high-performance motorsports, automotive racing, and industrial safety applications. This garment serves as a critical protective layer worn beneath racing suits, driving suits, and nomex overalls to provide thermal protection in high-heat environments. Designed for competitors and professional drivers who require certified flame resistance, this X-small bottom meets SFI Foundation 3.3 standards—the industry benchmark for nomex racing apparel certification.

Constructed from premium nomex fabric, the Underwear Bottom FR Black X-Small SFI 3.3 combines durability with lightweight comfort during extended driving sessions. Nomex is inherently flame-resistant and will not melt or drip when exposed to extreme heat, making it fundamentally different from standard cotton undergarments. The SFI 3.3 certification confirms this garment has undergone rigorous testing for flame propagation, thermal protection, and durability, ensuring reliable performance in cockpit environments where fuel-related fires or electrical incidents pose genuine safety risks. The black colorway offers practical stain concealment and maintains professional appearance under racing suits.

This X-small sizing accommodates drivers seeking a snug, form-fitting layer that reduces bunching beneath a racing suit while maintaining freedom of movement in the cockpit. Professional racers—whether in Formula, IndyCar, drag racing, or club-level motorsports—consistently pair SFI 3.3 certified base layers with their outer racing suits to satisfy sanctioning body regulations and achieve multi-layer thermal protection. The Underwear Bottom FR Black X-Small SFI 3.3 is an essential component of any driver's safety kit and works seamlessly with all nomex racing suits and SFI-approved overalls. For competitors serious about compliance and protection, this RaceQuip product represents trusted, certified performance.