Hello
That's what DIY is all about.
I tried to get a heading here for DIY. But that went down the drain. [ Later
Way to keep your feet warm using a **** light battery rheostat.
You can convert the old side battery type socks to dial up and down with a rheostat.
The picture of 2 pair of socks I used for many years. First a 6 volt then a 12 volt last a 18 volt.Used a banana plug to plug into the battery.
As modern battery's got more powerful . My feet got warmer ha ha. I could ware tennis shoes and stay warm on a tree stand. Also took the bottom off of one sock. And placed it my kidney area. Didn't know what cold meant back many moons ago.

[ Later