The original and best. Since 1972, the Sorel Caribou earned its reputation for warmth, durability and comfort the hard way: by protecting the feet of millions of Sorel customers through deep snow, harsh storms and the biting cold of long winters.  Rated to -40° below zero, the Caribou is the timeless choice for work and play in cold weather. The nubuck leather upper and handcrafted vulcanized rubber shell are seam-sealed for complete waterproofness and lined with a removable 9mm ThermoPlus felt InnerBoot that traps heat next to your foot, where it belongs. Underfoot, a thick rubber midsole insulates the boot from cold ground, while the Sorel AeroTrac non-loading outsole provides sure footing.