ESSEX GLAM Womens Thigh High Boots Low Block Heel Round Toe Zipper Stretch Boots Synthetic Synthetic sole Shaft measures approximately 21.5 Inches from arch Stunning Womens Stretchy Thigh High Casual Evening Boots Inside Half Zip For Easy Wearing Calf Circumference approx 13.5 Inch / 33.75 CM (Without Stretch) Boots Circumference approx 15.9 Inch / 39.5 CM (Without Stretch) This style is labelled with UK/EU size but this will be equivalent to the US size ordered. E.G US5/UK3, US6/UK4, US7/UK5, US8/UK6, US9/UK7, US10/UK8, US11/UK9