From Vionic, the Cora Leather T-Strap Slingback Thong Sandals feature: Premium leather upper Functional buckle closure Synthetic lining Built-in VIO MOTION technology footbed with contoured arch support and deep heel is shown to be effective in treating heel pain caused by plantar fasciitis or achilles tendonitis Lightweight, flexible EVA midsole Durable synthetic outsole Approx. 0.625" heel height Imported.