From Vionic, the Gretchen Knee High Suede Boots feature: Premium waxed suede upper Zipper closure  Back gore panel provides a tailored fit Synthetic lining Built in VIO MOTION Technology featuring contoured arch support, with shock-absorbing cushioning, and a deep heel cup to provide stability, and forefoot flexibility Durable synthetic outsole Approx. 15" boot shaft height Approx. 14.375" boot shaft circumference  Approx. 1.125" platform height Approx. 1.75" heel height Approx. 16.5"  wide boot shaft circumference Imported. It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support.