The size chart is suggestion only. Maybe there are different from what you know. You should check up your foot length careflly and then choose the right USA size for your foot by this chart only, not others. The foot length is suitable for your foot .If you hope to give your foot more room, or you could wear thick socks, you'd better choose bigger size, not just right size only. For example, a child foot length is 210MM, he always chooses 2.5 USA size (32 EUR size), he feels good.But about another child, his foot length is also 210MM, he always chooses 3 USA size (33 EUR size), he feels better The finished shoes maybe about ± 2cm error in measurement. t be used as the basis for fefunding.you should think about the size carefully.If you do not know about the size, you could ask us for help at any time.