The Coldspark UltraDry is a high performance winter hiking boot that keeps feet warm, without the bulk. Stay on the move through winter with waterproof comfort and aggressive traction. WOMENS COLDSPARK ULTRADRY The Coldspark UltraDry is a winter boot engineered for hiking and other active cold weather pursuits. Retain, a unique heat reflective and breathable lining, and an 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. Free from cumbersome winter boots, there's no limit to where you can explore. PRODUCT DETAILS TECH SPECS TECHNICAL SPECIFICATIONS-COLDSPARK ULTRADRY STYLE 7845 Fabric / Material:TPU Yarn Mesh Waterproof:UltraDry Waterproofing SystemInsulationRetain breathable reflective barrier (worth 200g traditional insulation) Footbed:Dual Density EVA Midsole:Dual-Density EVA Outsole:Vasque Monolith with ColdHold Compound Last:Perpetuum Weight:1 lb. 14 oz. (838g) Leather Type:PU Coated, Waterproof Leather Weight:1.6-1.8mm