I wear a size 11.  I've had one other pair of these.  Originally gotten a size 10 and had it stretched.  They were a good fit but if my feet swell, they were a might too tight so I gave them to a friend who has a smaller foot then me.  This current pair is a size 11, it feels a little bit big, I'll have to make sure I have thicker socks with them.  They are cushy and super cute.  I really like them