From Vionic, the Opal Perforated suede mules feature: Premium perforated suede upper Slip on styling Built-in VIO MOTION Technology footbed featuring contoured arch support, and a deep heel cup to provide stability & forefoot flexibility Lightweight, flexible EVA midsole helps reduce stress on feet, ankles and knees Durable TPU outsole Approx. 0.75" platform height Approx. 1.125" heel height It's recommended to wear your new pair for a few hours to allow your feet to adapt to the new support Imported.