Your feet work hard. so they deserve the warmth and comfort of the Men's ThermoBall Traction Mule V. This shoe combines ThermoBall Eco insulation with a high-traction rubber outsole to make a slip-on that's ideal for base camp. aprs ski or shuffling out to grab the morning paper. UPPER/ 100% recycled P.E.T. ripstop upper with a non-PFC durable water-repellent (non-PFC DWR) finish for added water repellency / ThermoBall Eco 100% recycled polyester insulation helps keep feet warm even when wet / Oso fleece collar lining for comfort / Collapsible heel with elastic side panels for easy on/off / SOLE UNIT/ Outsole made with up to 20% recycled rubber