In this video, I test whether I can keep my feet warm while I ice fish with inexpensive heated insoles (electric/rechargeable).
Although mine were cheap, I'm sure they all work on the same principle so the price won't make much difference. The insoles help, but just a little bit (this was also confirmed by the owners of more expensive ones). So, before you spend too much money - make sure that you can return them if you test them and you don't like them.
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