Break through the elements in the Men's Kamik Icebreaker Waterproof Winter Boot. Waterproof rubber and nylon upper in a winter boot style with a round toe Pull on entry with cinch lace collar 13 and 3/4 inch shaft height Temperature rated at -40 degrees Celsius/Fahrenheit Removable 8 mm Zylex® liner with moisture wicking and a comfort footbed TRACKER synthetic rubber traction outsole is oil and acid resistant.