sproulman
I think they have a commercial body cozy for tree stands. It should be great for you guys in the upper parts of the country. Here in Virginia, it doesn't get that cold on any regular basis. Only on rare ocassions will it get that cold, thank God!
As to the foot cozies, I have a pair and they work very well. I did get the larger size and do put them over my regular hunting boots. They keep me very warm and comfortable. But I must say the idea of wearing them as slippers with handwarmers in them without boots is a great idea. That is until you are ready to get out of the treestand and now have to put on them very cold boots!!!