Lower on the snow stake, but still high on utility; these boots are built to battle. They’re protected by a double density TPU waterproof shell and full waterproof construction. Insulating ActiveHeat insoles and ColdProof footbeds provide bonus warmth down below. Thermo 6 soles are sure to keep you anchored through slick and thin. Waterproof Construction. Double Density TPU Waterproof Shell. Waterproof Leather upper. 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. Grade 2 Tapered Nylon Insole. Compression Molded EVA Footframe. Merrell Air Cushion Midsole. 6mm Sole Lug Depth. Vibram Thermo 6 Sole/Trek Dura Rubber. Comfort Range to -25F/-32C.