My first pair of crocs. I wear 6.5regular size shoes, so wanted to buy J4, but  since it was not there, bought J5. It is slightly loose, but doesn't slip off since it is rubbery. Plus point of it being a little loose is that I won't get blisters at the toes or my heel. Will update if anything changes.

I ended up ordering two other pairs directly from their website for my daughter, since I couldn't find the right size and style with good price on Amazon.