I have worn out many pairs of moccasin-type sheepskin slippers and had suggested a fresh pair from my wife.  She got me these instead.  They were a little stiff to get on at first, but were actually warmer than the moccasins I had been using--surprising in that the moccasins come farther up the ankle.
My wife had read other reviews and was forewarned to order at least a half size larger.  I would strongly suggest everyone to order a half or full size larger.
They are very warm, and give me a more secure footing than the moccasins.  The sole gives me good traction.  The nap of the sheepskin seems just a squidge  fuller than any of my old ones, probably why they are so warm.