The RaceQuip SFI FR Racing Underwear Bottom is made with a blend of aramid and FRC fabrics to achieve a comfortable fire-retardant garment that is perfect for any racer. The properties of this unique fabric structure create a lightweight garment that performs like Nomex yet is much more cost effective. The Fire Retardant Cotton (FRC) component of the fabric promotes a soft and supple lightweight feel. Since it's hypoallergenic, it won't irritate your skin like some other materials tend to do. This proprietary fabric blend is also superior at wicking away moisture from the skin and dries quickly. All RaceQuip fire retardant underwear garments are machine washable and retain their shape well. The black color won't show racing stripes (or dirt). All items exceed SFI 3.3 certification and have an SFI tag sewn in place.