Features & Benefits Seam-sealed waterproof construction Waterproof nubuck leather upper Removable 9mm ThermoPlus felt InnerBoot Sherpa Pile snow cuff 25mm bonded felt frost plug Handcrafted waterproof vulcanized rubber shell Sorel AeroTrac non-loading outsole Sorel rated to -40°C (-40°F) Design Elements Cushioned Insole Cold Rated Fur Collar Insulated Molded Rubber Construction Nubuck Rubber Sole Slip Resistant Sole Vulcanized Rubber Waterproof