THE NORTH FACE THERMOBALL TRACTION V DENALI MULE SLIPPERS MEN'S Size 9 fleece lining inspired by our classic Denali jackets to create a new cold-weather classic that provides lasting comfort in lower temperatures. Upper: Recycled P.E.T. fleece upper with non-PFC durable water-repellent (non-PFC DWR) finish Lightweight ThermoBall™ Eco insulation retains warmth even when wet Oso fleece collar lining for comfort Easy on/off design Sole Unit: Outsole made with up to 20% recycled rubber