Carhartt FRV036 Flame Resistant Duck Vest with Carhartt's Quilt Lining. 13 ounce FR duck, 100% cotton. 10.5 ounce FR quilt lining: FR modacrylic batting quilted to twill face cloth. Two large front pockets with quilt lining. Inside patch pocket with hook and loop closure. Nomex rib knit collar. Brass front zipper with Nomex zipper tape has inside and outside protective flaps plus covered snaps for electric arc protection. Kidney flap. NFPA 70E Compliant. Flame resistant fabric by Mount Vernon Mills. HRC 4 ATPV(CAL/CM2) 54.3