From The North Face, the Women's Nuptse Logo Detail Ripstop Mules feature: Recycled P.E.T. ripstop upper Durable and insulated with 550 fill goose down certified to the Responsible Down Standard Foldable-heel design allows you to wear it as a mule Webbing pull loops at the heel and instep for easy on/off Durable indoor/outdoor rubber outsole Outsole made with recycled rubber Imported.