Carhartt's flame-resistant midweight canvas waist overall is quilt-lined for cooler days. Made of 8.5-ounce flame-resistant canvas, a blend of 88% cotton and 12% high-tenacity nylon, it has a 6.75-ounce flame-resistant quilt lining. It sits slightly below the natural waist and features a full seat and thigh, chap-style double-front panels, reinforced back pockets, ankle-to-thigh brass zippers with Nomex zipper tape and self-fabric kick panels at the bottom of the leg openings. Main seams are triple-stitched for durability. NFPA 70E compliant. Read more about Carhartt's flame-resistant line. Field-Tested 8.5-ounce flame-resistant canvas Double-front panels Ankle-to-thigh brass zippers with Nomex zipper tape Click Here For Technical Information