Having geslen of the problems with the size determination here, I just ordered 2 pairs: a pair in size 20/21 and 22/23 in one. My Son Wears normal shoe size just 23! The pair in size 20/21 fits perfectly to the foot and he can without toes are concentrated run it. Since I am so excited because the shoes can be quickly pulled on and off, I keep the second pair just already for later. Actually, I have him this shoe for outside purchases, so it does not slip between outdoor shower and plunge pool ... But noted that he absolutely nonslip stands in the shower tray with these shoes! That's really great, because now the shoe is in daily use, because in the shower you get a sandbox monster but the fastest clean! After the shower off your shoes over the sink and just rinse your feet! And I do not just stick to those non-slip mats or strips in my shower.
