In production since 1972 the Caribou Boot by Sorel is a true winter classic. Constructed to withstand the freezing cold elements the boots are designed to keep your feet warm to temperatures of -40°. Other features include:  Seam-sealed waterproof construction with waterproof nubuck leather upper Removable 9mm Thermo Plus⢠felt Inner Boot Sherpa Pile⢠snow cuff 2.5mm bonded felt frost plug Handcrafted waterproof vulcanized rubber shell with Sorel Aero Trac non-loading outsole  Available in limited quantities these are guaranteed to keep your feet warm however cold this winter gets.