Simpson racing underwear provides full-body protection from head to toe, crafted from fire-resistant, SFI-rated fabrics to help keep you safe on race day and beyond. Shop lightweight options including pants, short- and long-sleeve shirts, socks, balaclavas, helmet skirts, and boxer shorts, all designed for hours of comfort during long stretches at the track. Every piece of Simpson racing underwear and undergarments is made from a double jersey interlock knit featuring a patented blend of high-performance fibers with exceptional thermal protection. The result: racing base layers you can count on in critical moments. Trust Simpson to deliver premium racing clothing and underlayers engineered to give you the confidence and protection you need behind the wheel. Shop the full selection at Behrent’s and gear up with race-ready undergarments built to perform.