The SOREL® Caribou earns a reputation for warmth, durability and comfort. A nubuck leather upper and vulcanized rubber shell are seam-sealed for waterproof protection, keeping feet warm and dry in cold weather. A removable 9mm ThermoPlus™ felt InnerBoot retains heat to keep feet warm. The AeroTrac™ outsole maximizes traction on snow and ice. For superior protection and performance, sport the Caribou winter boot.