RJS Racing Fire Retardant Underwear is designed to give you precious extra seconds in a fire. RJS Racing Fire Retardant Underwear is constructed from heavy duty Nomex fabric, with waist and arm cuffs to help seal off you arms and legs from stray flames. The design and construction materials of the RJS Racing Fire Retardant Underwear gives these life saving items an SFI 3.3 certification.