Features of The North Face Youth ThermoBall Traction Mule II Slipper Combines a super-insulated, fleece-lined slipper with a full-sheet rubber Outsole that provides traction, indoors and out Upper: Water-repellent, 100% recycled P. E.T. ripstop Upper Lightweight ThermoBall Eco Insulation retains warmth Elastic side panels for easy on/off Cozy fleece lining Sole Unit: Full-sheet rubber Outsole for traction Approx Weight (-+ pair): 3.4 oz (94 g)