Positioned as a longtime favorite in the Sorel line, we lace up the Caribou Boot for urban exploration in wintery streets. The vulcanized rubber shell prevents moisture from seeping through, while the wool felt liner keeps us warm when apres ski celebrations extend well-past sunset. Sorel's original winter-proof boot designed for everyday wear Seam-sealed leather upper is waterproof and durable Vulcanized rubber shell increases durability Removable wool blend liner ensures warmth in cold climates Bonded felt frost plug insulates against ice and snow Aggressive AeroTrac sole ensures traction on snowy surfaces Sorel comfort rates this boot to -40F Upper Material full-grain leather, vulcanized rubber Waterproofing seam sealed Insulation ThermoPlus Removable Liner. Closure. lace Midsole. 2.5mm bonded felt frost plug Sole. Sorel AeroTrac Shaft Height 9in