The evolution of one of Merrell's most successful winter boot franchises ever. The waterproof construction and and Vibram Arctic Grip underfoot with 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. Synthetic materials utilized for a differentiated look without sacrificing durability. Waterproof membrane seals out water and lets moisture escape Waterproof full grain leather and mesh upper Heavy-duty, waterproof, YKK zipper for easy on and off 100% recycled webbing Protective and abrasion resistant rubber toe cap 100% recycled fleece lining 200 grams synthetic lightweight, low bulk insulation for warmth and comfort SOLARCORE Aerogel insole provides underfoot superior warmth while being extremely flexible and ultra-thin 100% recycled mesh footbed cover Cleansport NXT treated for natural odor control 5% recycled PU removable footbed Merrell Air Cushion in the heel absorbs shock and adds stability Molded nylon arch shank Super Rebound Compound midsole Vibram Arctic Grip All Terrain outsole Vibram XS Trek Evo outsole