Features of The North Face Women's ThermoBall Traction Mule V Denali Shoe Upper: Recycled P. E.T. fleece 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 Approximate weight per shoe: 7.37 oz