From Vionic, the Georgina Tumbled Leather Lugged Sole Booties feature: Premium water repellent tumbled leather upper Zipper closure  Stretch gore panel at ankle for additional fit and comfort Back pull tab 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. 5.12" boot shaft height Approx. 9.25" boot shaft circumference  Approx. 1.25" platform height Approx. 1.75" heel height Imported. It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support.