UPPER/LINING • Waterproof Construction • Waterproof Synthetic Leather Upper • Waterproof Synthetic Leather/Polyester Mesh Bellows Tongue • Merrell conductor fleece • 400 Grams Of Thinsulate™ Ultra Insulation • M-Select FRESH naturally prevents odor before it starts for fresh smelling feet • TPU Backstay With Snowshoe Strap Ridge • 7.5mm Narrow Gauge Webbing/Integrated Leather Loop Lacing System Midsole /Outsole • Coldproof™ Insulating Footbed • In-Board™ Compression Molded Eva Footframe With Grade 4 Tapered Nylon Insole Molded To Bottom • Air Cushion® Midsole • 6mm Sole Lug Depth • Vibram® Chameleon Thermo™ Sole/Trek Dura