The Coldspark UltraDry is a winter boot engineered for hiking and other active cold weather pursuits. 200g of 3M Thinsulate insulation and our proprietary UltraDry waterproof membrane keep feet comfortable while on the move during the winter. A multi-directional outsole lug pattern maximizes traction in icy and wet conditions. Upper: TPU Yarn Mesh. Midsole: Dual-Density EVA. Footbed: Dual Density EVA. Outsole: Vasque Monolith with ColdHold Compound. Leather: 1.6mm Waterproof PU Coated Leather. UltraDry Waterproofing System. Weight: 2 lbs. 4 oz (1030 g). Spot clean. Imported.