Underwear Top FR Black X-Large SFI 3.3

The Underwear Top FR Black X-Large SFI 3.3 by RACEQUIP is a purpose-built fire-retardant base layer designed for motorsport competitors, emergency personnel, and high-heat industrial workers who require reliable thermal protection. This long-sleeve undergarment serves as a critical safety component beneath racing suits, flight gear, or protective uniforms, providing a certified barrier against flames and extreme temperatures. The SFI 3.3 certification confirms compliance with the Society of Automotive Engineers' stringent flammability standards, making it an essential investment for anyone operating in environments where fire exposure is a genuine risk.

Constructed from a fire-retardant blend fabric, the Underwear Top FR Black X-Large SFI 3.3 combines comfort with performance through engineered fibers that resist ignition and limit flame spread—critical properties that distinguish it from standard athletic wear. The high-collar design extends neck protection, a vital area in racing and high-risk occupations, while the long-sleeve construction delivers full arm coverage without restricting mobility. The black colorway maintains professional appearance across all work environments, and the X-Large sizing accommodates a broader fit suitable for layering under restrictive protective gear while maintaining breathability and moisture management during extended wear.

This fire-retardant top is indispensable for competitive drivers, pit crew members, and industrial workers operating near combustion sources or high-temperature equipment. Motorsport organizations and sanctioning bodies mandate SFI 3.3–certified base layers during competition, making this garment mandatory rather than optional for licensed participants. The lightweight construction at 0.69 lbs ensures minimal bulk under racing suits or hazmat gear, allowing unrestricted movement during critical operations. Whether paired with a racing suit, flight suit, or firefighting ensemble, the Underwear Top FR Black X-Large SFI 3.3 provides the certified protection and durability demanded by professionals who cannot compromise on safety.