OK, so my tiny little feet get so incredibly, seriously cold, they absolutely ache. When that happens, sleep is off the table. It doesn't matter how many pairs of fluffy warm socks I put on; the cold is bone-deep, and no cover is going to help.Years ago, I bought a Sunbeam foot warming heating pad. Fantastic. But it tended to be somewhat unwieldy, got smushed up during the night, and was heated only on the bottom. Still, it was a lifesaver.When it died a couple of months ago, I was freaked out, because it was no longer available. I took a chance on this item, and oh my...where's it been all my life? I will crow about it a bit:1. It's heated on the bottom AND the top. It's a huggy, hot envelope for your feet. It's stiffer than the Sunbeam model I used, so it doesn't get all tangled up during the night.2. The heat setting goes all the way to a 9, but 4 is HOT! I can't imagine needing the "9" setting. On the worst nights, when my feet are like little blocks of ice, "4" works perfectly.3. It stays put. Since it's a bit stiffer than the "blanket" type units, it remains in place under the sheet and blankets on your bed. You can turn over to your other side, and your feet don't drag the whole thing with you; rather, you just spin inside of it as it stays stationary.It has seriously been a godsend for me. I've had freezing cold feet all my life, and this is the best product I've ever used to mitigate it. By a longshot.If you struggle with freezing cold dogs, this is your ticket out. Buy it!