Waterproof leather upper. 200 grams of Thinsulate® Insulation treated with M Select Fresh odor control. M Select Dry waterproof construction seals out water and lets moisture escape so keeping your feet dry. Active HEAT Footbed for increased cushioning and comfort. EVA outsole is durable and shock absorbent. Merrell air cushion in the heel absorbs shock and adds stability with an EVA midsole for cushioning. 4mm Lug height. M Select ICE GRIP tuness each outsole with durable traction that grips when and where you need it.