Our Polar Cap liner has a plus acrylic cuff and a moisture management system to retain warmth. The liner also has our Heat Pack Pocket to keep you warm in the coldest temperatures. Inside, a 13mm Texel® liner captures warmth and wicks away moisture to maintain a warm dry climate inside the boots no matter what the weather is like outside. A 13mm EVA footbed gives you an extra layer of thermal protection, cushioning and support. An acrylic snow cuff blocks moisture and cold and seals in warmth. Order next size up if wearing with heavy socks. Ht: 11". Wt: 5.3 lbs./pair. Men's whole sizes: 7-13.