SFI 3.3 FR Underwear Top Black XSM

The SFI 3.3 FR Underwear Top Black XSM by Allstar Performance is a fire-retardant long-sleeve base layer engineered for drivers, pit crews, and automotive enthusiasts who work in high-heat environments or require SFI certification compliance. This garment serves as critical protective wear under race suits, nomex jackets, and other fire-resistant gear during competitive motorsports events, trackside work, and professional automotive fabrication. The high-collar design and long sleeves provide maximum skin coverage, essential for drivers operating vehicles where engine heat, fuel exposure, or ignition risk demands multi-layer thermal protection.

Constructed from a fire-retardant blend fabric, the SFI 3.3 FR Underwear Top meets SFI Foundation 3.3 specifications—the automotive racing industry standard for thermal protection garments. The material is engineered to resist ignition, char resistance, and thermal penetration, creating a critical barrier between skin and external heat sources. The high-collar construction and full long-sleeve coverage minimize exposed skin areas, reducing burn risk in accident scenarios. The X-Small sizing accommodates drivers with slighter builds or those requiring a snug base-layer fit for maximum comfort beneath race suits without bulk or bunching during prolonged driving sessions.

Professional racers, circuit drivers, and pit crew members benefit most from this SFI 3.3 FR Underwear Top when competing in sanctioned motorsports events where fire-retardant gear is mandatory or highly recommended. The black color resists visible staining during intensive work sessions, maintenance tasks, or extended track time. This base layer functions effectively under nomex race suits, leather jackets, and multi-layer racing suits, providing an additional thermal buffer without restricting movement or adding excessive weight. Compatibility extends across automotive fabrication workshops, welding areas, and any environment where elevated heat exposure and fire risk demand certified protective apparel.