Ajvani Women's Low Heel Stretch Calf Zip Buckle Strap Riding Boots Size 9 40 Synthetic Synthetic sole Sizes displayed on the shoe are in UK or EU sizes. US 5 = UK 3 / EU 36 -- US 6 = UK 4 / EU 37 -- US 7 = UK 5 / EU 38 -- US 8 = UK 6 / EU 39 -- US 9 = UK 7 / EU 40 -- US 10 = UK 8 / EU 41 3 cm (1.2 Inches) Heel Height 9.5 cm (3.7 Inches) Sole Width 36 cm (14.1 Inches) Shaft Height & 38 cm (14.9 Inches) Shaft Circumference Product measurements were taken using UK size 5. Please note that measurements above may vary by size.