Underwear PRO-TX Bottom Black Small SFI 3.3

The Underwear PRO-TX Bottom Black Small SFI 3.3 is a specialized base layer designed for drivers who demand SFI-rated fire protection beneath their racing suit or helmet. Whether you're running a track day, competing in motorsports, or simply prioritizing safety during high-performance driving, this underlayer serves as your first line of defense against thermal hazards.

Built to SFI 3.3 specifications, it meets the stringent safety standards required by sanctioning bodies across autocross, road racing, and performance driving disciplines. The PRO-TX construction utilizes advanced flame-resistant materials engineered to withstand extreme temperatures while maintaining breathability during extended driving sessions. The black colorway provides a professional appearance and helps dissipate heat more effectively than lighter alternatives.

This base layer is ideal for serious drivers who want to layer properly beneath their racing suit without compromising fit or mobility. The small sizing works best for drivers of smaller stature or those who prefer a snug fit under their competition gear. With a weight of just 0.55 lbs, this compact design offers minimal bulk while delivering maximum thermal protection.