Waterproof 600 denier nylon and synthetic nubuck upper. Adjustable snow collar and Easy-Grab Lace Lock. 8 mm Zylex removable liner. Moisture-wicking lining. Adjustable midfoot hook and loop strap. NiteRays reflective technology. Waterproof and lightweight synthetic RubberHe shell. Proprietary technology offers superior traction and flexibility. SNOWAVE lightweight synthetic RubberHe outsole. Multi-directional lugs for superior traction in the snow. Comfortable down to -40C.