I looked into downy slippers after hearing my roommates rave about theirs. I bought these rather than the expensive REI brand but they're not what I was hoping for.

My feet get COLD. Always cold. I thought that these would be warmer than a regular slipper because of all the downy insulation. Honestly, they don't impress me at all. My feet still get cold in the slippers both in and out of the house (I do make short trips with them outside when I let the dog out) The slightly more durable bottoms are nice. They are about equivalent to putting on a pair of warm socks. So these would be nice if you like warm feet in bed but don't want your feet constricted by socks.
And if you don't want your feet constricted, buy a size larger because like other reviews have said, they do run small.

I know there are better down slippers out there. I might have to shell out more money for 'em though.

**EDIT: One of my roommates tried these on and loves them. He now wants me to buy more of them as Xmas gifts. He stole my pair and wears them everywhere. Thinks they are the best thing ever. They look goofy but he thinks they're warmer than shoes and socks outside in the snow and concrete. Comfortable too. I added a star for that.