Product Description Often imitated but never equaled, Sorel's Caribou is the true icon with a nubuck leather upper, waterproof seam-sealed construction, and a removable felt inner boot for warmth, comfort, and protection in cold, wet winter weather. • Comfort rated to -40°F/C for extreme warmth • Removable, insulating 9 mm washable felt inner boot with two-layer construction: ~ Polypropylene and recycled polyester wick moisture and trap warm air ~ Reinforced seams and heel area for exceptional durability ~ Stretch front shaft ensures comfortable fit and seals cold air out ~ Sherpa Pile snow cuff to keep snow out • Aero-Trac rubber outsole and nonloading lugs for sure-footed, slip-resistant traction on snow and ice • 2.5 mm bonded felt frost-plug midsole increases thermal barrier between your feet and cold ground • Seam-sealed waterproof construction • Waterproof nubuck leather upper for protection and durability • Handcrafted, waterproof, vulcanized rubber shell to keep feet dry chat • Shaft height: 10 in. (25.4 cm)