Field-tested Carhartt® protective long-sleeve T-shirt is made of lightweight 6.5-oz. flame-resistant 55% modacrylic/45% cotton knit to protect workers from burns caused by electric arc or flash fires. NFPA 70E compliant. Features a rib-knit collar and cuffs, left chest pocket and side-seamed construction to minimize twisting. U.S.A. Available in Light Gray or Navy. Big style available in 3XL and 4XL sizes.