The Sorel Caribou boots have been imitated many times over. But as they say imitation is the sincerest form of flattery and the Caribou boots stand the test of time. The main boot construction consists of a waterproof Vulcanized rubber shell that will stay flexible in the bitterest of cold. The rugged upper Nubuck leather is also waterproof and seam sealed which has been handcrafted to perform season after season in the worst of weather. The removable ThermoPlus Innerboot lining offers additional insulation but also has wicking properties to carry moisture away from your feet to help keep you dry. A durable outsole affords a nice distant between you and ice or snow plus creates a sturdy, lightweight platform to carry you across the worst of terrain. The Sorel Caribou is a sturdy workhorse of a boot and is sure to perform exactly as you expect and want it to year after year. Removable 9mm Washable Recycled Felt Inner Boot, Sherpa Pile Snow Cuff, 2.5mm Midsole Bonded Felt Frost Plug, Waterproof: Yes, Material: Waterproof Nubuck Leather, Type: Boot, Insulated: Yes, Sole Material: Sorel AeroTac, Model Year: 2019, Product ID: 531322, Model Number: 1002871014 9.5, GTIN: 0803298582186