Go a size up or maybe two sizes up. I usually wear a size 10.5 and have this size 11 but they are too small. Ironically I wear a size 10.5 in my Ultraboosts, Yeezy and NMD. These all fit well.
Pros
My husband loves them when he gets out of the shower, especially at the gym.
Cons
I'm going to the swimming pool. It's a shame to wear them.