13 oz. FR duck by Mount Vernon Mills. 100% cotton. Full seat and thighs. Arc resistant snap closure at waist. Brass zipper fly with Nomex® FR zipper tape. Two reinforced back pockets. Triple-stitched main seams. Leg openings fit over work boots. HRC 2 label sewn on front waistband. NFPA 70E and NFPA 2112 compliant.-Arc Rating ATPV 16.0 calories/cm 2