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I would avoid battery powered anything. If it fails, you get really cold. Get something that will keep you warm without a power pack.
For me, I'm bringing good socks. I'll either bring heavy Simms socks that I use for fly fishing or some SmartWool socks. SmartWool is, in my opinion, the best cold weather sock there is. Soft, thick and warm, they wick moisture away but because they are wool, they keep your feet warm even if they do get wet.
A base layer of polypropylene that can wick moisture away is also good. UnderArmor, Patagonia and Simms make good base layers. I am bringing those as well. I figure if they keep me warm when standing in glacial water, they should help at Arrowhead.
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