I use the mm size for my shoes and cross reference that into the US/UK numerical size. Usually that gets me a perfect fit regardless in the difference in the common size between. Even doing this these shoes run a bit small. I could probably go up a half size and be more comfortable despite the 245mm size being spot on fit in every other shoe I have. I can live with it but be aware they're a little snug.
Besides that, they seem to help with my lifting form. Nice and flat on the bottom. These have helped me keep my heels planted in an overhead squat far better than my old "crossfit" type shoes. I like the kind of retro style they have.
From the manufacturer
