I bought a size 8.  I wear an 8 D and this sandals fits even though I usually wear an 8 1/2 in Sketcher closed toe shoes.  It is adjustable and very comfortable.  I bought it for Disney World because I had a blister on the tip of a big toe.  I didn't even know I had them on.  If you have small feet, I could see how they might be big.  My left foot swells so this sandal is perfect.