The North Face ThermoBall Traction V Denali Mules - Men。The North Face ThermoBall Traction Mule V Slipper in Mallard Blue. These slippers combine the warmth of ThermoBall Eco insulation with a high-traction rubber outsole, making them ideal for base camp, après-ski, or just lounging at home. Features a recycled ripstop upper with a durable water-repellent (DWR) finish to keep feet dry. The interior is lined with cozy oso fleece for maximum comfort. A collapsible heel with side elastic panels allows for easy on/off. Good pre-owned condition with some light visible wear on the outsoles. No major rips or tears in the fabric.