Carhartt 's flame-resistant relaxed fit midweight canvas jean is perfect every day work wear when you need protection from electric arcs or flash fires. Made of 8.5-ounce flame-resistant canvas, a blend of 88 percentage cotton and 12 percentage high-tenacity nylon, it has a relaxed seat and thigh and a contcarhartt'sed waistband to eliminate gapping in the back. It also features a cell phone pocket, utility pocket, left leg hammer loop, arc-resistant high-tension snap closure at waist, a brass zipper fly with nomex zipper tape and two reinforced back pockets. Main seams are triple-stitched for durability. Straight leg openings fit over work boots. Nfpa 70e compliant. Read more about carhartt 's flame-resistant line. Field-tested 8.5-ounce flame-resistant canvas, midweight cell phone pocket nfpa 70e compliant click here for technical information