Waterproof Nubuck leather upper. 400-gram Thinsulate™ Ultra Insulation adds warmth. Permanent direct-attach molding seals out water. Mesh lining. Removable full-cushion footbed. Tough, lightweight polyurethane midsole. Lightweight nylon shank fights fatigue. Optional steel toe rated ASTM F2413-05 M I/75 C/75 EH.