SFI 3.3 FR Underwear Top Black 3XL

The ALLSTAR PERFORMANCE SFI 3.3 FR Underwear Top in black, size 3XL, is a fire-retardant long-sleeve base layer engineered for high-heat motorsports environments. This SFI 3.3-certified underwear top provides thermal protection and meets sanctioning body requirements for drivers competing in racing series where flame-resistant apparel is mandatory. The high-collar design offers extended neck protection, a critical consideration in open-cockpit and closed-cabin racing scenarios where exposure to engine heat and potential fire hazard is an occupational reality.

Constructed from a fire-retardant blend fabric, this underwear top is engineered to resist ignition and limit flame propagation—a measurable specification verified by the SFI Foundation standards certification. The long-sleeve configuration and high collar extend protection across the torso, arms, and neck without bulk. At 0.71 lbs, the garment is lightweight enough for layering under race suits without adding excessive thermal burden, allowing drivers to maintain mobility and comfort during extended competition sessions. The 3XL size accommodates larger frames while maintaining the fitted profile necessary for consistent wear under a race suit.

This product is designed for professional and amateur racing drivers across all motorsports disciplines—drag racing, road course, oval track, and off-road competition. Any driver competing in SFI-sanctioned events or racing series requiring SFI 3.3 base layer certification will find this garment meets those specific regulatory requirements. The black colorway is standard for motorsports and pairs seamlessly with most race suits and helmet combinations. Serious racers integrate fire-retardant base layers as non-negotiable safety infrastructure, not optional equipment.