Originally Posted by
Seattle Forrest
Already exists. I use these in my ski boots, fit into my custom footbeds. You can also get an extension cord which would allow you to put the battery in your pocket (in skiing world, they attach to the power strap on your boots). They work great in ski boots, and some swear by them in cycling but I've never needed them but they would have been nice at subzero fahrenheit temps.
J.