Specifications The US size here refers to the man’s US . If still not sure, Refer to the UK and EU sizes Size: US 4/ UK 3/ Euro 36/ 22.5cm US 4.5/ UK 3.5/ Euro 36.5/ 23cm US 5/ UK 4/ Euro 37.5/ 23.5cm US 5.5/ UK 4.5/ Euro 38/..