Waterproof leather upper. Polar fleece lining. 100 grams of Thinsulate® Insulation treated with M Select Fresh provides odor control. M Select Dry waterproof construction seals out water and lets moisture escape, keeping your feet cool and dry. Active Heat EVA footbed for increased comfort and support. Merrell air cushion in the heel absorbs shock and adds stability with an EVA midsole for improved comfort. 4mm Lug height. M Select ICE GRIP tuness each outsole with durable traction that grips when and where you need it.