These are really nice slippers, very warm and well made, but like another reviewer found they are a snug fit when you first put them on. Normally I'm a size 9 so ordered the 9-10, but still they were too small. Initially I couldn't wear them with any socks on; without socks they were only just ok. I really wanted some new slippers, so ended up wearing them anyway. They have stretched over time (one month) and now fit well (with or without socks).
You could order a size bracket larger (as I did for my wife) or, if you are the bottom end of the bracket you are ordering then let them stretch.
Warning: these are not the kind of slippers you can get on your feet without using your hands, so if you have trouble bending down perhaps they are not for you.