Sorel Caribou Boot - Women's Cinnamon 10 Leather Upper: Waterproof nubuck leather upper. Seam sealed waterproof construction Insulation: Removable 9 mm washable recycled felt inner boot with Sherpa Pile snow cuff Midsole: 2.5 mm bonded felt frost plug Outsole: Handcrafted waterproof vulcanized rubber shell with Sorel aero-trac non loading outsole