Show Story Black Riding Moto Biker Engineer Buckle Flat Knee High Boots,LF50503 Synthetic Synthetic sole Approximately 4.5cm/1.8" heel Approximately 37cm/14.6" shaft (without the heel) Boot opening measures approximately 38cm/15" Please Use the Sizing Chart Image on the Left. Sometimes, our estimated size is not the same as the labeled size due to large or small make of an item.