It is made of fire-retardant cotton cloth, which has passed the federal (191.5903) test. The product can be fireproof and flame retardant, and can resist welding spatter. It can still maintain the fireproof and flame retardant performance after tens of times of washing. The welding cap has new designs such as Velcro connection buckle, shoulder sealing protection, Velcro free enclosure, etc., which is more humanized.