Relaxed through the waist, hip and thigh with a boot cut leg opening Ariat's FR M4 Boot Cut denim combines flame-resistant technology with a great fit and unmatched comfort.* CAT 2* NFPA 70E* NFPA 2112* ATPV 20* Relaxed through waist, hip and thigh* Low rise* Boot cut leg opening* 13 oz ring-spun denim* Look of light hand sanding and tacking* No-rub comfort inseams* Anchored belt loops* Heavy-duty zippers and hardware* Extra deep front pockets.