Whether you're relaxing by the fireside or exploring your surroundings, freezing conditions are no match for the ThermoBall™ V Traction Winter Mules. Upper | Recycled P.E.T. Ripstop with Non-PFC Durable Water-Repellent (Non-PFC DWR) Finish Sole Unit | Outsole Made with up to 20% Recycled Rubber Approx Weight | ½ Pair: 231 g / Pair: 462 g Sizes | Medium: 7-14 (Whole Sizes) UPPER: Recycled P.E.T. ripstop with non-PFC durable water-repellent (non-PFC DWR) finish to help keep feet dry Lightweight ThermoBall™ Eco insulation retains warmth, even when wet Oso fleece collar lining for comfort Collapsible heel with elastic side panels for easy on/off SOLE UNIT: Outsole made with up to 20% recycled rubber Thermoball™ eco Made from post-consumer recycled polyester, lightweight Thermoball™ Eco effectively insulates in cool, damp conditions. This product is made from recycled materials, which helps reduce landfill waste and minimize its impact on nature. Synthetic padding retains heat even in humid conditions. Rubber compounds provide grip, traction and durability on both dry and wet surfaces.