The North Face ThermoBall Traction Mule Leather in black elevates a cold-weather icon with premium craftsmanship. Originally designed for post-expedition comfort, this slip-on mule is now reimagined in high-quality leather sourced exclusively from Leather Working Group–certified tanneries. ThermoBall™ insulation made from 100% recycled polyester provides reliable warmth even when wet, while an Oso fleece collar lining adds cozy comfort. A collapsible heel with elastic side panels makes on-and-off effortless, and the outsole—made with up to 20% recycled rubber—delivers traction indoors and out. Lightweight, packable, and built to last, this mule is the ultimate blend of performance and everyday luxury.