Exactly what I'd been looking for.
Heated Booties 1 Pair
These are the best. My feet feel like ice cycles at night, but now with these, my feet stay very warm and I sleep great. I've tried heating pads, microwavable heat packs, and other devices which don't work well. But these are perfect. They heat your feet all over, not just in one spot. One of my best purchases ever.