From Vionic, the Sonora Suede Buckle Hardware Detail Tall Boots feature:  Premium soft suede upper  Side zip closure  Functional buckle strap detail with gusset for adjustability Synthetic lining  Built-in VIO MOTION Technology footbed featuring contoured arch support and deep heel cup to provide stability Meta Dome cushioning Durable rubber outsole  Approx. 15" boot shaft height Approx. 15" standard calf shaft circumference Approx. 17" wide calf shaft circumference Approx. 2.75" heel height Imported. Styling Notes: It is recommended to wear your new pair for a few hours to allow your feet to adapt to the new support.