Even when temperatures drop well below freezing, you can still enjoy warm and dry feet with the Sorel Caribou WP boots. Firstly, the boots have a removable and washable thermal inner boot made from recycled felt. On the other hand, a thick felt midsole protects against the cold. The outside of the Caribou WP is made from waterproof nubuck leather and vulcanized rubber. It has a waterproof construction and all seams are sealed. The soles have the right profile to get through snow and ice, and it can withstand temperatures down to minus 40 degrees.