Size Chart:

US5: Ball Girth: 8.1", Foot Length: 8.7"

US6: Ball Girth: 8.2", Foot Length: 8.9"

US6.5: Ball Girth: 8.4", Foot Length: 9.2"

US7: Ball Girth: 8.6", Foot Length: 9.5"

US8: Ball Girth: 8.8", Foot Length: 9.7"

US9: Ball Girth: 8.9", Foot Length: 10.0"

US9.5: Ball Girth: 9.1", Foot Length: 10.2"

US10.5: Ball Girth: 9.3", Foot Length: 10.5"

US11: Ball Girth: 9.5", Foot Length: 10.8"

This data was obtained from manually measuring the product, it may be off by 1-2 CM