From Vionic, the Wave RX  Recovery Platform Arch Support Sandals feature: Synthetic upper Received the APMA Seal of Acceptance It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support Light weight built-in VIO MOTION Technology footbed with contoured arch support Dual-density midsole for shock-absorbing cushioning Deep heel cup provides stability Durable synthetic outsole Approx. 1.25" platform Approx. 2.375" heel height Imported.