Soft nubuck pairs with a rugged waterproof rubber shell on these timeless, utilitarian Sorel boots. The removable felt ThermoPlus lining is trimmed with plush sherpa, and D-ring hardware accents the lace-up closure. Lug sole. A classic SOREL style since 1972, the Caribou Boot is the timeless choice for those who work and play in cold weather. Designed to keep your feet warm in subzero temperatures, the Caribou features a lightweight and flexible shell, seam-sealed waterproof construction, and durable materials to protect your feet from the damp chill of winter. Available in both men and women's sizes, the Caribou is a must-have for those who want to brave harsh temperatures in style.