The Sorel(r) Caribou(tm) winter boot for women features a handcrafted waterproof construction and vulcanized rubber shell outsole which maintains thermal properties, flexibility and traction in cold temperatures. The seam-sealed, waterproof leather upper remains supple and durable, while the removable 9mm ThermoPlus(tm) felt InnerBoot helps wick moisture away providing comfort and easy to remove for quick drying.