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I had some battery heated socks way back in the mid to late 80s that worked ok. They were the grey wool socks with the red strip on top but also had a D battery holder at the top. There was a heating element that ran under the base of the toes. It tended to drain the battery in about an hour but I usually used them on a 2-hour run; that first hour was very important on keeping the toes unfrozen. I have no idea of the brand. I think I bought them at Yeagers in Bellingham, WA.
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