Oboz proprietary insole is what theyre known for. Molded to match the specific shape and construction of every pair Oboz makes, this purpose-designed technology delivers the kind of fit, feel and performance thats unmatched in the industry. These thermal insoles feature an insulated top sheet for warmth and a Mylar bottom sheet to reflect heat back to your foot, keeping toes nice and cozy Theres no denying feet sweat and trails can get muddy. Theres also no denying the ability of our proprietary waterproofing system, B-DRY, lets sweat escape while keeping moisture out Freeze Guard Insulation keeps feet feeling great. 100% post consumer recycled polyester feels pretty good too Oboz Ousel Mid Insulated B-DRY Winter Boots - Women's, Wide, Black Sea, 11 US, 81402-189-11-Wide