When skiers and snowboarders lovingly refer to their "Sorels" it's almost a sure thing that they are talking about their Sorel Caribou™ snow boots. That's because this popular and proven snow boot remains a winter cornerstone throughout decades of tough use--and the originals still keep a steady footing around day lodges and chalets. Beneath the waterproof nubuck upper and soft acrylic/wool snow cuff on the Sorel Caribou™ is a removable 9-mm. ThermoPlus® felt inner boot that's rated to -40ºF the sort of warmth you need from the first flake to the last melting slop. Sorel recently refined the outsole with an Aerotrac™ natural rubber sole (it will mark light floors) but all the durability remains the same.