does anyone know of a solid product thats usb and or rechargeable , i have seen some of the offers by zippo, maybe a bit too bulk for shoe inserts , and no i don't want disposable hot hand bull crap they last like 3 minutes no thanks .

im looking at some like this but i would have to get some sort of battery system hacked together to make it work , but on the positive side they are cheap , and easy to replace , unlike those 100 plus dollar heated insoles or the unproven heated socks ..????

https://www.amazon.com/Electric-Heat.../dp/B07B2DB8WG