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never say never, some people just have poor circulation in their feet or hands and maybe can benefit from some extra help.
I always said that too till I went on high blood pressure meds...been fishing on the hard water 40 years and always was able to clear holes with my hands and my feet never got cold with good boots. Toes get very cold now as do finger tips so this may be a solution for me!
they say one size fits all..not in my case..
My wife works for a ski.and snowboard tuning machine company. One of the side businesses they own is Hotronic. I have been using Hotronic XLP One Heated Socks for several years now. They work great inside waders when I float tube in cold water and great in ski boots. Never needed them for ice fishing yet, imagine they would work good there too.https://www.amazon.com/Hotronic-Heat-Sock-Classic-Large/dp/B01M6Y5EWE/ref=asc_df_B01M6Y5EWE/?tag=hyprod-20&linkCode=df0&hvadid=312128224504&hvpos=1o6&hvnetw=g&hvrand=10517653640988687081&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=1014208&hvtargid=pla-567865895959&psc=1