From Vionic, the Tide Patent Leather Thong Sandals feature: Patent leather and fabric upper Slip on with soft woven toe post Built-in VIO MOTION technology footbed with contoured arch support Lightweight, flexible EVA midsole absorbs shock, reducing stress on feet, ankles and knees Durable TPR outsole with patterned tread helps improve traction Received (APMA) American Podiatric Medical Association Seal of Acceptance It's recommended to wear your new pair for a few hours to allow your feet to adapt to the new support Approx. 0.625" platform height Approx. 1.25" heel height Imported.