Measure the circumference of the centre your elbow with a straight arm.
| Size | Range (cm) | Range (Inches) |
| Small | 20cm - 23cm | 7.9" - 9.0" |
| Medium | 23cm - 26cm | 9.0" - 10.2" |
| Large | 26cm - 29cm | 10.2" - 11.4" |
| XL | 29cm - 32cm | 11.4" - 12.6" |
| XXL | 32cm - 35cm | 12.6" - 13.8" |
If you are between sizes it is advisable to go for the larger size.