12.5-ounce 98% Cotton/2% Spandex FR denim - Meets the performance requirements of NFPA 70E/ASTM F1506 UL classified to NFPA 2112 - Rugged Flex stretch technology - Sits at the waist - Straight leg opening - Brass zipper fly with Nomex FR zipper tape - Arc-resistant button closure at waist - Stronger sewn-on-seam belt loop - Carhartt FR label sewn on back pocket - NFPA 2112/CAT 2 label sewn on waistband - Two reinforced back pockets - Imported