Carhartt FRB100 Flame Resistant Relaxed Fit Jean - Straight Leg. 11.75 ounce, 100% cotton FR denim. Sits slightly below the natural waist. Relaxed fitting seat and thighs. Garment washed for soft hand. Arc resistant button closure at waist. Brass zipper fly with Nomex zipper tape. Two reinforced back pockets. Double stitched main seams. Leg openings fit over boots. NFPA 70E and NFPA 2112 compliant. Flame Resistant fabric by Mount Vernon Mills. HRC 2 ATPV(CAL/CM2) 15.2