| Size | Circumference around the instep, just above the ankle | Approximate shoe size | 
|---|---|---|
| Small | 18-21 cm | 35-38 | 
| Medium | 21-23 cm | 38-41 | 
| Large | 23-25 cm | 42-46 | 
Tip: 
If you have narrow ankles, the tip is to go more on shoe size when choosing a size.
If you have narrow feet and are just between 2 sizes, the tip is to take the smaller size, so that the protection is not too loose.