Carhartt FRB13 Flame Resistant Denim Dungaree. 11.75 ounce, 1005 cotton FR denim. Sits slightly below the natural waist. Full seat and thighs. Multiple tool and utility pockets. Left leg utility band. Arc resistant high tension snap closure at waist. Brass zipper fly with Nomex zipper tape. Two reinforced back pockets. Carhartt's famous triple stitched main seams. 19 inch leg opening fits over work boots. NFPA 70E Complaint. Flame resistant fabric by Mount Vernon Mills. HRC 2 ATPV(CAL/CM2) 15.2