The Women's ThermoBall Traction Mule V from The North Face are super comfortable slippers for on the road or at home. The comfortable slip-ons with extra-light Thermoball insulation convince as unbeatable warmers on cold evenings. The upper material is made of recycled ripstop polyester. For easier on and off, the slippers are equipped with a flexible heel flap and stretch inserts. The rubber sole is extra durable and grippy.