The North Face Thermoball Traction Slippers. Pry yourself out of those ski boots and pull on extremely warm, durable and water-resistant mules with tough high-traction soles. Insulated, fleece-lined slip-ons. Lightweight ThermoBall™ powered by PrimaLoft® insulation retains warmth when wet. Durable, water-resistant, 100% recycled P.E.T. ripstop upper. Cozy, Oso-fleece lining. Collapsible heel with elastic side gore panels for easy on/off. 40% recycled-rubber sole for supreme traction. Imported.