Carhartt FRR44 Flame Resistant Duck Bib Overall with Carhartt's Quilt Lining. 13 ounce, 100% cotton FR duck. 10.5 ounce FR quilt lining: FR modacrylic batting quilted to twill face cloth. High back with FR elastic suspenders and FR center release buttons. Chap style double front enhances durability. Multiple tool and utility pockets. Hammer loop. Ankle to thigh leg zippers with Nomex zipper tape, and protective flaps with arc resistant snap closures. FR melamine buttons at waist. Brass zipper fly with Nomex zipper tape. Carhartt FR label sewn on back pocket, HRC 4 label sewn on left chest pocket. NFPA 70E compliant. Flame resistant fabric by Mount Vernon Mills. HRC 4 ATPV(CAL/CM2) 54.3