Proven protection in a closer-fitting work jean. The Ariat FR M5 Straight Basic Stackable Straight Leg Jean is built from 13 oz ring-spun, 100% cotton denim with permanent flame resistance — no stretch, no shortcuts. The straight fit through the seat and thigh gives you a cleaner silhouette, while the 18.5" straight leg opening stacks neatly over your work boots. FR Protection CAT 2 rated — dual-hazard protection against flash fire and electrical arc Arc rating: 20 cal/cm² — protects against second-degree burns from electrical arc exposure Meets NFPA 70E / ASTM F1506 performance requirements UL® classified to NFPA 2112 Permanently flame resistant — protection does not wash out Built for the Job Extra-deep front pockets for secure storage Strategically reinforced belt loops at key stress points No-rub comfort inseam lays flat to minimize chafing during all-day wear Heavy-duty zipper and hardware for lasting reliability Construction 13 oz ring-spun denim — 100% Cotton, classic non-stretch Imported Straight fit — mid rise, straight through seat and thigh 18.5" straight leg opening Available in waist sizes 29–60, inseam lengths 30–36.