| Size | Diameter (mm) | Circum. (mm) |
|---|---|---|
| 12 | 16.5 | 51.8 |
| 14 | 17.2 | 54.0 |
| 16 | 17.8 | 55.9 |
| 18 | 18.5 | 58.1 |
| 20 | 19.2 | 60.3 |
| 22 | 19.8 | 62.2 |
| 24 | 20.6 | 68.7 |
All measurements are approximate. If your measurement falls between two sizes, we recommend choosing the larger size for a more comfortable fit.
