These Carhartt® Flame-Resistant Quilt-Lined Duck Bib Overalls are made with a 13-oz. flame-resistant 100% cotton duck exterior and an 11.5-oz. lining of flame-resistant mod acrylic batting quilted with flame-resistant twill face cloth. Cotton is breathable, soft, and non-irritating on your skin, and thanks to flame-resistance, these overalls are more windproof and waterproof than usual. Some of that toughness is also thanks to what's inside: quilt lining. This lining is made to feel soft despite being rugged and durable. It offers insulating comfort to make it easier to work outdoors on cold days. The high back of these Carhartt bibs offers more insulation. Flame-resistant suspenders keep the fit comfortable. The flame-resistant center-release buckles keep the design looking classic. The chap-style double front offers two layers of toughness. The ankle-to-thigh leg zippers are protected with Nomex® flame-resistant zipper tape and protective flaps. The flaps are held in place with arc-resistant snap closures. Meets NFPA 70E standards and UL classified to NFPA 2112.