Made with 12.5 ounce, FR denim: 99% cotton/ 1% spandex; Garment washed for soft finish. Rugged Flex® durable stretch technology for ease of movement, traditional fit sits slightly below the waist and slim seat and thigh; 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 and is UL® Classified to NFPA 2112.