The Sorel Women's Caribou Winter Boots often imitated but never equaled. If you want the real deal with timeless styling this is it. This boot is constructed with seam sealed waterproof construction; the top is made of the waterproof nubuck leather upper. The bottom is made of a handcrafted water proof vulcanized rubber shell, and the Sorel ™AeroTrac™ non-loading outsole. It has a comfortable, removable 9mm Thermoplus felt inner boot. The boot is topped off with a Wool/acrylic blend snow cuff.