Since my wife is a chef, she is always looking for ways to keep our freeze dried dinners warm while they re-hydrate. We don't want to use gas to keep them bubbling, but we also don't want to them get cold. We've used towels, fleece....but I finally created this masterpiece out of some old foam sleeping mat scraps. And it works way better than anything else we've tried!
The outer ring is held in place by pushing the pot up against a stone or log...and when not it use, it can also serve as a seat cushion or pillow.
And no, I don't have plans. If you need them, this project is not for you!