Waterproof full-grain leather with Nubuck leather. 400-gram Thinsulate™ Ultra Insulation adds warmth. Breathable GORE-TEX® Waterproof membrane. Removable double density footbed adds cushioning and stability. Tough, lightweight polyurethane midsole. Wolverine DuraShocks slip-resistant Vibram® rubber outsole maximizes traction and performance. Permanent direct-attach molding seals out water. Lightweight nylon shank fights fatigue.