Field-Tested 7-ounce, lightweight, flame-resistant twill NFPA 70E compliant Flame-resistant melamine buttons Feel comfortable and safe at work in the Carhartt Big & Tall Flame-Resistant Classic Twill Shirt, designed to handle the most rugged working conditions. This men's button-down FR twill shirt with durable, triple-stitched seams, keeps you safe from dangerous arcs and flames. The utilitarian design features two flap pockets on the chest, while the loose fit allows for freedom of movement. Meets the performance requirements of NFPA 70E/ASTM F1506. Rated at ATPV 8.6Cal/CM^2. Since 1889, Carhartt has been building best in class apparel for the active worker. Loose fit: a working man's fit with the most room to move. Button-down collar and front. Extended sleeve plackets with adjustable two-button cuffs. Two chest flap pockets with button closures. Carhartt-strong triple-stitched main seams. UL classified to NFPA 2112. NFPA 2112/CAT 2 label sewn on sleeve placket. Carhartt FR label sewn on left pocket. Shirttail hem. 88% cotton, 12% nylon. Machine wash cold.