Made of 8.5-ounce FR canvas: a blend of 88% cotton and 12% high-tenacity nylon. Sits slightly below the natural waist. Full seat and thighs. Arc-resistant button closure at waist. Brass zipper fly with Nomex FR zipper tape. Two large side cargo pockets with pen slots. Two reinforced back pockets. Leg openings fit over boots. Triple-stitched main seams. Carhartt FR label sewn on back pocket, HRC 2 label sewn on waistband. NFPA 70E and NFPA 2112 compliant. Flame-resistant fabric by Mount Vernon Mills.