I used to be faithful to a single pair of slippers. They were a moccasin type slipper, also sheepskin, and I purchased a new pair every year, and sometimes two, because the sheepskin matted down and wore off, leaving bare leather.
This year, I decided to try these booties instead, and I will never go back. The footbed is nice and squishy, and the sheepskin has kept its loft. A bonus is the sole, which lets you go outside for the mail or whatever, without putting on shoes!