Waterproof over the sock boot built with hand laid premium, natural rubber with removable polyurethane footbed. Comfort rated from -40 to 30°F. Feature 7 mm neoprene insulation and nylon shank. Polyurethane Aeroform Shell fleece lining wraps the entire foot for cushioning comfort and warmth. Rugged multi dimensional lug pattern of Antarctic outsole is designed for slippery winter conditions. Durable, neoprene gusset accommodates different calf sizes and makes it easier to slide boot on and off. Active fit to keep foot secure and comfortable while on the move. 16 height. Black. Men s sizes.