Kamik Men's Blackjack 2015 Dark Brown 11 D US Leather^Nylon Choosing the Kamik Blackjack 2015 boot is a gamble that you will always win for both style and protection! Waterproof leather and nylon upper. Waterproof and flexible synthetic rubber shell. Seam-sealed waterproof construction keeps out the wet elements for a dry foot environment. Fixed 200B 3M&trade; Thinsulate&trade; insulation provides protective warmth against the cold. Moisture-wicking brushed nylon lining for excellent breathability. Padded collar and waterproof gusset tongue. Traditional lacing system with rustproof metal eyelets. Removable Kamik comfort antibacterial footbed offers both comfort and an odor-free environment. DEFENDER synthetic rubber winter outsole provides excellent traction. Temperature rating: -40&#176;F/-40&#176;C. (Yup, those conversion