How to measure to find your perfect fit:
Size 3 - 22 to 22.5cm
Size 4 - 23 to 23.5cm
Size 5 - 24 to 24.5cm
Size 6 - 25 to 25.5cm
Size 7 - 26 to 26.5cm
Size 8 - 27 to 28.5cm
Size 9 - 28 to 29.5cm