Features of The North Face Men's ThermoBall Traction Mule V Shoe Upper: Durable, water-resistant, 100% recycled P. E.T. ripstop Upper PrimaLoft ThermoBall Eco synthetic Insulation Cozy Oso-fleece lining Collapsible heel with elastic side Gore panels for easy on/off Sole Unit: 40% recycled rubber Outsole for supreme traction