Carhartt FRB002 Flame Resistant Twill Work Pant. 9 ounce FR twill: a blend of 88% cotton and 12% high tenacity nylon. Sits slightly below the natural waist. Full seat and thighs. Carhartt's famous triple stitched main seams. Arc resistant button closure at waist. Brass zipper fly with Nomex FR zipper tape. Two reinforced back welt pockets. Leg openings to fit over work boots. Carhartt FR label sewn on back pocket, HRC 2 label sewn at waistband near front coin pocket. NFPA 70E and NFPA 2112 compliant. Amplitude flame resistant fabric by Milliken. HRC 2 ATPV(CAL/CM2) 12.4