I have two other pairs that are very similar to these. All three pairs are size 10.5. The two pairs I have fit perfectly. The new couple is stupid. They don't really fall off my feet, but they're not as snug as the previous two pairs either. I will return them. I don't know. I wear them a little to see how they go. Another issue is the color of the shoes bleeds onto my white socks. Light blue shoes. It's annoying because the color doesn't seem to wash off my once-white socks. I wear them a little but I can return them. So far not satisfied.