Measure around your palm just below the knuckles, excluding your thumb. Size 6: 16-17cm, Size 7: 17-18cm, Size 8: 18-19cm, Size 9: 19-20cm, Size 10: 20-21cm, Size 11: 21-22cm. For the best grip and control, we recommend a snug fit. If you're between sizes, size up for comfort or size down for tighter ball contact.