Lapco FR flame-resistant modern Carpenter Jeans were designed with all the style, the pockets, and the safety features you need for work, now in a lighter, 10oz. Fabric and medium wash for your comfort. Non-Conductive button closure. Sewn with NOMEX thread. Brass zipper with NOMEX tape. 10 oz. Flame-resistant 100 percent cotton denim. Certification: ATPV 15 cal/cm2, HRC/cat 2, NFPA 70 E, UL classified ASTM F1506, UL classified NFPA 2112.