I usually wear an 8 maybe 8.5 so based on the reviews I tried and ordered. 7.5 and they worked, they fit well, snuggled up. I don't think I can wear them with socks but that was never the goal, they fit well. I do not mind. It's definitely summer clothes. Can't comment on the expected lifespan of the shoes, have had them for a couple of weeks now, Northern California is too cold to wear them at the moment. But I will order another pair (brown), they look good, very stylish, and they seem to be able to withstand normal clothing, walking, water but definitely not running or similar activities.