From Vionic, the Eureka Leather Slingback Sandals feature: Premium leather upper Hook-and-loop closures with 4 points of adjustability to ensure a secure, customizable fit  Synthetic lining Cushioned EVA insole VIO MOTION technology footbed with built-in arch support and deep heel cup Lightweight, flexible midsole Durable synthetic outsole Approx. 0.75" platform height Approx. 1.125" heel height Imported. It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support.