My girls' have about 10 pair of Sun San Sandals, but for some reason this style ran very small on my son.  I'm having to exchange them for an 8.  We even printed out the size chart (from the sun san website) and it noted he needed a 7.  :(  But on the plus side, I LOVE amazon's exchange option.  His new ones will be here tomorrow and I haven't even sent the other pair back yet, but will tomorrow.