Herr's slipper guide
1) Slippers must slip on: so, no high-top style slippers that wrap up over your ankle
2) Slippers mustn't slip off: no open back slippers
3) Fur lined slippers are great, but watch out for a slipper thats going to be too hot, no one likes a sweaty slipper.
4) Slippers should have hard soles.
5) Slippers need to have utility. Need to take the trash out with a foot of snow on the ground? If you have to change into regular shoes, you have the wrong slippers.