7.4-ounce, FR Knit: 74% cotton/24% rayon/2% spandex. Carhartt Force® fights odors and its FastDry® technology wicks away sweat for warmth and comfort. Self fabric crewneck and cuffs and smooth flatlock seams. Carhartt logo and NFPA 2112/HRC 2 flag label sewn to exterior. Meets the performance requirements of NFPA 70E standards and is UL® Classified to NFPA 2112.