Our flame-resistant duck bib overall is unlined for comfort in warmer weather. Made of 13-ounce, flame-resistant 100% cotton duck, it features high back with flame-resistant elastic suspenders and high temperature nylon center-release buckles. It also has a chap-style double front for durability, multiple tool and utility pockets, hammer loop, ankle-to-mid-thigh brass leg zippers with Nomex® zipper tape, flame-resistant melamine button at waist and protective flaps and arc-resistant snap closures. NFPA 70E compliant.