The waterproof construction of the Merrell Coldpack 3 with Vibram Arctic Grip underfoot is designed to  keep you dry and deliver traction in any conditions mother nature can throw at you. With 200 grams of insulation and a fleece lining your feet will stay warm when the temperatures dip. • Waterproof membrane seals out water and lets moisture escape • Waterproof full grain leather upper • Double stretch gore for easy on and off • Protective and abrasion resistant rubber toe cap • 100% recycled fleece lining • 200 grams synthetic lightweight, low bulk insulation for warmth and comfort • SOLARCORE® insulation with Aerogel provides underfoot superior warmth while being extremely flexible and ultra-thin • 100% recycled mesh footbed cover • NXT treated to prevent odor • 5% recycled PU removable footbed • Merrell Air Cushion in the heel absorbs shock and adds stability • Molded nylon arch shank • Super Rebound Compound midsole provides durable shock absorption to help reduce torque and allow for a smooth transition into the midfoot • Vibram® Arctic Grip™ All Terrain outsole designed to effectively extend the winter traction season, due to the enhanced durability and versatility • Vibram® XS Trek Evo outsole designed to provide optimal balance of traction and flexibility on wet surfaces