RF ROOM OF FASHION Women's Stretchy Over The Knee Riding Boots Synthetic Synthetic sole Shaft measures approximately 21 from arch MEASUREMENT (taken on size 6): Heel Height - 1.25"; Shaft Height and Top Opening Circumference: See Picture for Detailed Measurement by Size FEATURES: Premium vegan suede or leather. Pull on construction. They have inner partial side zipper for easy wear. Low Block heel. TPR rubber out-sole. Finished with a cushioned insole and soft lining. Designed in USA Product measurements were taken using size 6, width M. Opening circumference goes up proportionally by size.