Classic Sorel. Developed in 1972, the Caribou's purpose has always been to keep your feet warm when shoveling sidewalks after a mid-winter snowfall. The boot features ruggedly waterproof seam-sealed construction. A heat-capturing 9mm ThermoPlus recycled felt liner is fully removable and has a Snow cuff made from Sherpa pile to keep snow out. A fully waterproof upper constructed with Nubuck leather tightens with a lace-up closure. The shell is built from handcrafted vulcanized rubber and has a rugged outsole with a grippy aero-trac tread. This boot will keep your toes warm during evening walks to the rink and winter vacations to Banff. 9mm ThermoPlus felt liner Waterproof construction Waterproof leather upper Seam-sealed construction Vulcanized rubber shell 2.