What Our Gearhead(R) Experts Are Saying: "I keep the Thermoball Leather Mules by the door year-round. They're incredibly warm and comfortable, and the leather upper gives them a more refined look. Whether I'm lounging at camp or walking the dog on a chilly morning, they're my go-to." The North Face Thermoball Traction Leather Mule brings base camp warmth to everyday life with a blend of rugged function and refined style. Born from the needs of cold-weather expeditions, this insulated slip-on offers everything we want after a long day in the mountains-or just a long day, period. Lined with soft Oso fleece and packed with ThermoBall(TM) insulation, this mule provides lasting warmth even when wet. The collapsible heel and elastic side panels make it easy to slide on and off, while the durable leather upper adds sleekness and structure. Underfoot, a partially recycled rubber outsole grips everything from frosted decks to city sidewalks. Whether we're recovering post-adventure or simply chasing cozy comfort, this is a winter icon that's always ready.