Black Stallion WF4010-ST 7 oz. 88/12 Flame-Resistant Work Shirt 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, It features a chest pockets with flaps and pencil slot. This shirt 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.