What is the correct size for a boy who...
What is the correct size for a boy who wears size 4 shoes? Size 4.5?
You'll need a 22.0 or 22.5, unless you're buying for next year and then I'd grab a 23 if available. Yup, add the first two numbers of the Mondo point system together to get a rough translation to US uni/men shoe sizes. Cool huh?