Reef Todos Flip Flop (Toddler/Little Kid/Big Kid)

I bought these too small the first time and returned them.My 6 yr old son wears a size 2 in regular shoes, but these only fit in a size 4/5 Big Kid.I figured it out my measuring the length of his feet in inches and using that as my guide to purchase these shoes.I hate the fact that the picture shows the elastic in the back when Big Kid sizes DO NOT come with the elastic. That elastic should at least be optional or sold separately.I had to make one myself since my son has never worn flip flops before and needed the extra support.The shoe itself fits well and is comfortable, well, except where it rests between his toes.That rubs a bit, so I am working on that.It''s just a matter of him getting used to it.