These crew boss pants are made of 60% Kevlar™ and 40% Nomex™ IIIA in a rip-stop weave. Advance Pants from crew boss offer superior durability, abrasion resistance and meets NFPA 1977, 1998 standards. Crew boss fabric provides exceptional cut and tear resistance and longer life. Flame resistant fabric remains strong and flexible after extreme thermal exposure. Advance pants include all of the great features of our Brush Pants such as oversized pockets, elastic waist and generous cut. Crew Boss Advance Pants are manufactured to ISO 9001-2000 edition standards. Original tags must be kept on pants for returns or exchanges. Products willn't be accepted back without them.