Oil and Gas Safety Supply Men's FR Jean 13 oz denim FR twill: 100% cotton Ratings for flame retardant or flash fire: CAT 2 ATPV 16.4 NFPA 70E NFPA 2112 Imported FR apparel does not require special detergents but you should never use fabric softeners. This may coat the fiber and mask flame resistant performance. It may also serve as fuel in case of combustion. You can dry clean this flame resistant garment. Flame resistant fabric Regular fit denim jean 13 oz denim FR twill: 100% cotton Ratings for flame retardant or flash fire: CAT 2 ATPV 16.4 NFPA 70E NFPA 2112 You can dry clean this flame resistant garment.