Waterproof membrane seals out water and lets moisture escape. Waterproof coated leather and mesh upper. Metal hook traditional lace closure. 100% recycled fleece lining. 400 grams lightweight, low bulk insulation keeps you comfortable. EVA foam insole.  Merrell Air Cushion in the heel absorbs shock and adds stability.  Molded nylon arch shank.  Lightweight EVA foam midsole for stability and comfort.  Merrell sticky rubber outsole with durable traction that grips when and where you need it.