13-ounce 100% cotton FR duck - 11.5-ounce quilt lining: FR modacrylic batting quilted to FR twill face cloth - High back with FR elastic suspenders and FR center-release buckles - Chap-style double-front enhances durability - Brass zipper fly with Nomex FR zipper tape - FR melamine buttons at waist - Multiple tool and utility pockets - Ankle-to-thigh brass leg zippers with Nomex FR zipper tape and protective flaps with arc-resistant snap closures - 13-ounce duck fabric is CGSB155.20-2000 certified - 2-inch contrasting trim (RT80 220C N3000) with 3M Scotchlite Reflective Material (#9740) ANSI/NFPA 2112 approved reflective trim - 360 degree visibility around legs - Carhartt FR and NFPA 2112/CAT 4 labels sewn on front pocket - Meets the performance requirements of NFPA 70E standards and is UL Classified to NFPA 2112 - CAT - 4 - ATPV (CAL/CM2) - 54.3 - Replaces 100171