Sorel Caribou Boots 2011: The original and best. Since 1972, the Sorel Caribou Boots earned their reputation for warmth, durability and comfort the hard way: by protecting the feet of millions people through deep snow, harsh storms and the biting cold of long winters. Don’t settle for substitutes when you can have the original and still the best. Rated to -40° below zero, the Caribou is the timeless choice for work and play in cold weather.