A great combination of durability, comfort, and protection. This lined overall resists flash fire and arc flash, but never hard work. It's not just what you want, it's what you need. • 13-ounce, 100 percent cotton FR duck • 11.5-Ounce, quilt lining: FR mod acrylic batting quilted to FR twill face cloth • high back with FR elastic suspenders and FR side-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 • Carhartt FR and NFPA 2112/cat 4 labels sewn on front pocket • meets the performance requirements of NFPA 70E and is UL Classified to NFPA 2112