9-ounce 98% cotton/2% spandex canvas - Rugged Flex durable stretch technology for ease of movement - Sits at the waist - Comfortable fit through the seat and thigh with more room to move - Secure cargo pocket with utility pocket and cell phone storage - Reinforced Dungaree back pockets - Stronger sewn-on-seam belt loops - Straight leg opening - Carhartt FR label sewn on back pocket; NFPA 2112/CAT 2 label sewn on coin pocket - Meets the performance requirements of NFPA 70E/ASTM F1506 and is UL Classified to NFPA 2112 - CAT 2 - ATPV (CAL/CM2) -