I had a size 9 reef a few years ago and fit so well.  Most comfortable sandals I ever put on.  Decided I could only wear reef sandals.  Time came for new ones, and found these on Amazon.  Purchased a size 9, but felt a bit smaller when I put them on.  Thought maybe I'd have to break them in.  I wore them for an entire day and my feet were actually hurting b/c it was too narrow and just didn't feel right.  Never had that happen with the other reef size 9's.  Not sure why the sizes are different, but I sent them back and am in the process of waiting for size 10's.  Hopefully these fit much better.