The women’s ThermoBall TRACTION Bootie uses leading insulation technology in a comfort-driven bootie for campfires or winter mornings at home. Thermoball insulation mimics goose down’s loft and heat-retention. The upper is a water-resistant, 100% recycled PET ripstop fabric, providing element protection if you need to step out. 40% recycled rubber is used on a high-traction outsole. The bootie slips on and off easily.