From Vionic, the Winny Leather Gum Sole Lace-Up Sneakers feature: Leather upper Received APMA Seal of Acceptance It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support. Adjustable lace-up closure Synthetic lining Built-in VIO MOTION Technology footbed with contoured arch support Lightweight EVA midsole Durable synthetic gum outsole Approx. 0.75" platform height Approx. 1" heel height Imported.