13-ounce 100% cotton FR duck - 11.5-ounce quilt lining: FR Modacrylic batting quilted to FR twill face cloth - 100% flame resistant modacrylic resin insulation - High Back with FR suspenders and FR center release buckles - Chap-style double front for durability and increased thermal performance - Multiple tool and utility pockets - Ankle to thigh leg zippers with Nomex FR zipper tape and protective flaps with arc-resistant snap closures - FR melamine buttons at waist - Brass zipper fly with Nomex FR zipper tape - Carhartt FR label sewn on bib pocket; NFPA 2112 labels sewn on left chest pocket - Meets the performance requirements of NFPA 70E standards and is UL Classified to NFPA 2112 - CAT - 4 - ATPV(CAL/CM2) - 54.3 - Replaces style# FRR44