Sorel Caribou Boot - Women's Boots 8.5 CIN leather-and-rubber Shaft measures approximately 8.5" from arch Seam-sealed waterproof construction. UPPER: Waterproof full-grain and suede upper MIDSOLE: 25 mm bonded felt frost plug OUTSOLE: SOREL AeroTrac non-loading outsole INSULATION: Removable 9mm ThermoPlus InnerBoot. Wool/acrylic blend snow cuff.