Funny you should say this... I went to a fireside several weeks back, and it was crazy cold. I had on two pairs of socks, and some weatherproof hiking boots. I was still freezing. I drove my BRZ home, and when I got home and took my boots off, my right heel was completely numb. I thought it probably had something to do with the cold, but really, my heel wasn't that cold. I think maybe in my shivering, I was sitting in a bad position, and with all the layers, it caused a circulation issue. I've never had it happen again, even after driving for a lot longer of a drive. Not sure this helps, but at least you know someone else who had the problem...
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