FRB100 - M FR Signature Denim Jean Carhartt's flame-resistant relaxed fit jean is garment washed for softness. Made of 11.75-ounce, 100% cotton flame-resistant denim, it sits above the waist, it has a relaxed-fitting seat and thighs, arc-resistant button closure at waist, brass zipper fly with Nomex® zipper tape. Back pockets are reinforced and main seams are double-stitched for durability.• Meets the performance requirements of NFPA 70E and is UL® Classified to NFPA 2112