Do they make a version for your feet?
I wish!! I use the full length chemical foot warmers. They cost twice as much as the toe warmers but they do work.
Yes, they do make similar for feet. I have some socks that has a slick outer sleeve on the toes where you put the hot packs. I also have the gloves and they are ....okay. Better than not having them anyway.
It seldom, if ever, gets below say 25 degrees here when hunting luckily.
For the hands, I prefer to use surgical gloves under my heavy shooting mittens without the hot packs. REALLY helps. I may keep a hotpack in my front jeans pockets and occassionally take them out.
For my feet I take off my hunting boots, put my wool socked feet ino slippers that come over my ankles and slip my feet into Boot Over Wraps. May not be for everyone but do give the surgical gloves a try some time.