Check our sizing chart here:
|XS||EU 36-39||US m 5-7||US w 6-8|
|S||EU 40-41||US m 7-8||US w 8-10|
|M||EU 42-43||US m 8-10||US w 10-11|
|L||EU 44-46||US m10-11||US w 11-12|
|XL||EU 46-49||US m 11-14||US w 12-14|
FYFs generally stretch very well, hence fit many shoe sizes. Please mind that to return them and exchange them for another size, they seal should not be broken. If you broke it already and have sizing issues, contact us. We will find an acceptable solution.