Black Stallion PF4020-NV 7 oz. 88/12 Flame-Resistant Work Pants offers the comfort of cotton and the durability of nylon. 88/12 is a chemically-treated blend of 88% cotton and 12% nylon. The addition of nylon woven tightly on the inside of the FR cotton fabric makes the garment much more durable and comfortable. Stitched with FR aramid threads throughout, the zipper fly also has a FR button closure. The PF4020-NV meets a number of regulations; NFPA 2112 UL Certified, NFPA 70E; ATPV 9.3 cal/cm2 (PPE Cat 2), and meets OSHA 1910.269 and 1910.132.