9 oz 98% cotton/ 2% spandex canvas, rugged flex durable stretch technology for ease of movement, sits at the waist, comfortable fit through the seat and thigh with room to move, reinforced dungaree back pockets, secure cargo pocket with utility pocket and cell phone storage, stronger sewn-on seam belt loops, straight leg opening, NFPA 70E and NFPA 2112 compliant.