I normally wear a 7.5 in shoes, sometimes an 8. These don't come in 1/2 sizes and in clogs, Birkenstocks I end up going down in size so I ordered these in a 37. Too small! 38 worked like a charm! Same brand in Elsa mule and the 38 were a size too big! Waiting on 37s in that style to see how they fit. So size varies between styles in same brand!