Order a size smaller!  Please listen to the reviews. I wear a 10, so i bought a 9.5-10.  My foot was swimming in them.  I gave them to my husband who wears a size 12. I repurchased the smaller size 8-9, fit perfect, still room in them.  I can wear with or without socks.  If you have cold feet, these are the slipper for you!  My feet even sweat in them!