Carhartt FRS160 FR shirts keep you safe from dangerous arcs and flame. The shirt is made of gray 7-ounce, 88% cotton / 12% high-tenacity nylon FR twill, with durable triple-stitched seams that have a utilitarian design. There is a button-down collar and front with flame-resistant melamine buttons. The extended sleeve plackets include adjustable two-button cuffs. There are also two chest pockets with flaps, each with button closures. The FRS160 flame resistant shirt meets the performance requirements of NFPA 70E, UL classified to NFPA 2112