Im a size 9(women) and I got a size 39 EU and they fit great. I recently got a pair of the mayari birkenstocks (not on amazon) and I love them sooooo much but they're definitely expensive, so when I found out that these were less than half the price I was so happy! These are a rubber material and they are very squishy and comfy and completely waterproof! Theyre amazing! I might have to buy another pair!