From Vionic, the Rejuvenate Recovery Platform Slides feature: Synthetic upper Adjustable hook and loop strap Synthetic lining Dual-density midsole for optimal comfort Molded EVA footbed Durable rubber outsole Approx. 1.5" platform Approx. 2.5" wedge heel height It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support. Used but great condition