i bought these for myself and i am so glad i did. best slippers ive ever owned. very comfortable, cant wait to put them on every morning! i wear a size 7 so i ordered the medium which is made to fit a 6 1/2 - 7 1/2. they are a tiny bit loose when i wear them barefoot, not enough to bother me or take away from how great they feel but if you wear a 6 1/2 shoe you might have to wear thicker socks with them.