Stomp out any storm with this zip locked Thermo. Impenetrable waterproof protection fortified with a double density shell that stands up to the toughest conditions. Externalities like the front gaiter ring and snowshoe strap ridge on the TPU backstay keep you covered front and back. Serrated Thermo 6 soles slice and dice any surface condition. Waterproof Construction. Double Density TPU Waterproof Shell. Waterproof Leather upper. Front Zip Entry with Baffle Tongue. Polartec 200 Thermo Insulation Lining with Aegis. 400 grams of Primaloft Insulation with Aegis. Waterproof Leather Upper with Polyester/Nylon Mesh Bellows Tongue. TPU Backstay with Snowshoe Strap Ridge. 9.5mm Webbing Lacing System. Front Gaiter D-Ring. Coldproof Ortholite Insulating footbed. Activeheat Insole with Silver Reflective Film Between Insulating Polyester Layers. Compression Molded EVA Footframe. Merrell Air Cushion Midsole. 6mm Sole Lug Depth. Vibram Thermo 6 Sole/Trek Dura Rubber. Comfort Range to -40F/-40C.