7 ounce FR twill: 88% cotton, 12% high-tenacity nylon. Two chest pockets with flaps. Two pass-through pockets, so you can access your pants underneath. Left-leg utility band. Multiple tool and utility pockets. Spread collar. Brass front zipper with Nomex® FR zipper tape and inside and outside protective flaps. Split-back construction. Pleated bi-swing back. Triple stitched main seams. Leg openings fit over boots for easy on and off. Carhartt FR label sewn on back and front pockets; HRC label sewn on left-chest pocket. Meets NFPA 70E and NFPA 2112 standards. Flame-resistant fabric by Mount Vernon Mills.