Suede with lightweight, abrasion-resistant nylon upper for rugged durability GORE-TEX 100% waterproof, breathable lining for protection from the elements Optional PrimaLoft Gold insulation for comfort in extreme conditions Bi-Fit stability board evenly distributes weight underfoot and allows for comfortable flex 360-Degree rubber mud guard provides superior abrasion resistance and added durability 4-way stretch collar around ankle adds comfort and prevents debris from entering boot