I ordered these today after receiving a pair of 37/38's which were listed as corresponding to sizes 7.5 to 8. I ordinarily wear either of those sizes yet these flips were too small- my heel nearly hangs off the back edge. I now remember seeing others' reviews when I bought my 1st pair years ago which broke recently (got 3 years out of 'em) and should've trusted my instincts. Anyhow, they are very cute, comfy, and durable.