I buy these for my hubby after rave about my own for month - I take a punt and base my hubby 's size use the eur size to match with current shoe and sandal he have and ' shazam ' I have a win ... I have be wear these in a big kid size 6 because it be a 39 but nice and wide for I and they cost less so I have they in about 6 different color - WASSA -lrb- the hubby -rrb- love they we wear they walk the dog cause we usually end up in the water at the beach or in the creek and he think they be perfect - I get the one 's with the close in heel for myself , I be a little paranoid about cut my foot on rock and coral which can end up in a ugly infection ... really really comfy and you just can not kill 'em - throw they in the washer or a bucket with soap to freshen if they get a bit on the nose .