Use this size chart to identify the best fitting size for your new Mares X-Stream Fins. Please contact us if you have any questions about the fins or require any further assistance with sizing.
| Fin Size | UK Shoe Size | EU Shoe Size |
| X-Small | 5-6 | 38-39 |
| Small | 6.5-7 | 40-41 |
| Medium | 8-9 | 42-43 |
| X-Large | 9.5-11 | 44-45 |