Post-expedition comfort should never be an afterthought. That's why we created one of our most iconic styles-the THERMOBALL(TM) Traction Mules. As the original off-grid slip-ons, these warm, durable shoes (now available in a premium leather version) were born at base camp but adapted for everyday life. Lightweight and packable for easy transportation. Insulated and fleece-lined for unrivaled comfort and warmth. These are the all-in-one solution for running errands, apres relaxation or kicking-back at camp. These are an icon. Design: Upper: Leather upper THERMOBALL(TM) 100% recycled polyester insulation helps keep feet warm even when wet Collapsible heel with elastic side panels for easy on/off At The North Face(R), we purchase 100% of our leather from Leather Working Group-certified tanneries Oso fleece collar lining for added comfort Sole Unit: Outsole made with up to 20% recycled rubber