Lapco FR flame-resistant utility Jeans were designed for linemen, by linemen. These Jeans include all of the safety features and all of the convenient pockets you've been wishing for in your work Jeans. Fabric: 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.