13-ounce, 99% cotton / 1% Elastane FR duck Meets the performance requirements of NFPA 70E and ASTM F1506 UL® classified to NFPA 2112 Built to move with Rugged Flex® stretch technology Sits slightly below the waist; Comfortable fit through the seat and thigh with more room to move Straight leg opening Stronger sewn-on seam belt loops Multiple tool and utility pockets Triple-stitched main seams Brass zipper fly with Nomex® FR zipper tape Arc-resistant button closure at waist Carhartt FR label sewn on back pocket; NFPA 2112/CAT 2 label sewn on front waistband Imported