I bought a nice dark blue pair of j crew flip flops last year, they were just plastic, but weren't like CHEAP plastic. I really loved them, and was glad it lasted really long, but one day at school, it just BROKE and totally fell apart! It wasn't like my flip flops were that old! They were still in pretty good shape! I couldn't fix them and ended up having to throw away such expensive flip flops. Otherwise, i loved them, and they went with pretty much every outfit. I just wish they'd last longer.
Also, if you're wondering about the sizing, last year my feet were smaller; I wore about a size 5, but I bought a size 6 and it fit perfectly. You probably want to buy half a size larger, or just try them on first!