The North Face ThermoBall Traction Mule V in black is an iconic slip-on built for warmth, comfort, and everyday versatility. Originally designed for base camp recovery, this mule features a 100% recycled PET ripstop upper with a non-PFC DWR finish for water repellency. ThermoBall™ insulation made from 100% recycled polyester keeps feet warm even when wet, while an Oso fleece collar lining adds cozy comfort. A collapsible heel with elastic side panels makes them easy to slip on and off, and the outsole—made with up to 20% recycled rubber—delivers durable traction indoors or outdoors. Lightweight and packable, it’s a cold-weather essential.