From Vionic, the Gemma Flannel Mule Slippers feature: Flannel fabric upper Received APMA Seal of Acceptance Adjustable hook and loop strap Slip on Fabric lining Podiatrist-designed, bio-mechanically contoured arch support and deep heel cup to realign your stride and help correct pronation Flexible EVA midsole absorbs shock, reducing stress on feet, ankles and knees Durable synthetic outsole Approx. 0.125" platform height Approx. 1.375" heel height Imported.