Alaska is a mid calf boot with a front zipper, and a stitching pattern that streamlines the design. All of our Naot winter boots have an inner felt lining with a thin layer of foil to keep you warm, and a plush wool lining to make them comfortable and soft to the touch. The leather/nylon combination is also waterproof lined, and weather rated for minus 20 degrees Celsius. The footbed has been upgraded for optimum support and comfort. This boot also has the OC System – a grip system which allows for enhanced traction and grip in icy conditions. The grip simply pops out and twists when needed which brings down a set of metal spikes for traction.