Carhartt WFRB160 Womens Flame Resistant Relaxed Fit Denim Jean - Straight Leg. 14.75 ounce FR denim: a blend of 88% cotton and 12% high tenacity nylon. Relaxed seat and thighs. Contoured waistband eliminates gapping in back. Mid rise waist for added comfort. Arc resistant high tension snap closure at waist. Brass zipper fly with Nomex zipper tape. Two reinforced back pockets. Straight leg openings fit over work boots. NFPA 70E Compliant. Flame resistant fabric by Mount Vernon Mills. HRC 3 ATPV (cal/cm2) 25.0