If you live on a part of the planet where blizzards are a regular part of your winters, then the fully waterproof Blizzard XT with its new, Omni-Heat reflective lining and hand-crafted vulcanized rubber shell is just what old man winter ordered. Rated at -40, the XT offers only the best for the most extreme conditions. It also features a removable inner boot lining that’s 9mm thick for warmth and features Columbia’s Omni-Heat reflective technology, sealing in your foot’s heat.