Full-grain leather upper with tough 1000-denier Cordura® nylon. 600-gram Thinsulate™ Insulation adds warmth. Breathable GORE-TEX® waterproof membrane lining. Removable full-cushion insole. Tough, lightweight polyurethane midsole. Rubber lug outsole. Permanent direct-attach molding seals out water. Lightweight nylon shank fights fatigue. Steel toe rated ASTM F2413-05 M I/75 C/75 EH.