8.5 oz FR canvas by Mount Vernon Mills: a blend of 88% cotton and 12% high tenacity nylon. Sits slightly below the natural waist. Loose seat and thighs. Cell phone pocket and utility pocket. ARC resistant button closure at waist. Brass zipper fly with Nomex® FR zipper tape. Two reinforced back pockets. Triple stitched main seams. Leg openings fit over work boot. HRC 2 label sewn on front coin pocket. NFPA 70E and NFPA 2112 compliant.-Arc Rating ATPV 12.1 calories/cm 2 -Hazard Risk Category (HRC): 2