Simpson racing underwear and base layers cover your body from head to toe, made with fire-resistant, SFI-rated fabrics to keep you protected on race day and beyond. Find lightweight Simpson racing underwear pants, short and long-sleeve shirts, socks, balaclavas, helmet skirts, and boxer shorts that provide hours of comfort during long days on the track. Simpson racing underwear and undergarments are made from double jersey interlock knit composed of a patented blend of high-performance fibers with extraordinary thermal protective properties. Count on Simpson for racing clothing and underwear to give you the confidence you need to feel secure behind the wheel.