Sizes vary so the easiest way to check is to stand on a piece of paper and draw the outline of your foot.   Then measure it in centimeters from heel to big toe.  In other words the length of your foot.   To be on the safe side, measure both feet and use the biggest measurement.  Then add on half a centimeter (more if you're going to wear really thick socks) and check on our website to see whether we have your size in stock. Sizes are as follows:

24cm       Size 37

24.5cm    Size 38

25cm       Size 39

26cm       Size 40

27 cm      Size 41