The Carhartt Flame-Resistant Traditional Long-Sleeve Mock Turtleneck will keep you safe and warm on the job. Carhartt's Flame-Resistant Long-Sleeve Mock Turtleneck is great to layer or can be worn alone. Made of 6.5-ounce FR knit, a blend of 55% modacrylic and 45% cotton, it features a rib-knit mock neck collar and cuffs, side-seamed construction to minimize twisting and a left arm logo label. *NFPA 70E compliant