Hoyden brand sizes are designed to fit the following measurements:

Foot Length	USA	EU	UK
9.5"	6 - 6.5	36	4
9.75"	7 - 7.5	37	5
10"	8 - 8.5	38	6
10.25"	9 - 9.5	39	7
10.75"	10 - 10.5	40	8