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I used neoprene socks, GoreTex trail runners and Crescent Moon neoprene overbooties glued to the shoes at the Arrowhead 135 race in Minnesota last week. It was -30(f) at the start (-45 wind chill) and stayed cold throughout the race. Many of the runners wore just trail runners and sock combos, most of them dropped, some got bad frostbite on their toes, one may lose most of his toes. I'm not sure how they do it when the temps plunge. My feet can stay fairly warm when running, at least in the system I used, but what about during a stop to melt snow, make a meal, campout for an hour or two? Trail runners would leave my feet ice cold (although the neoprene overbooties prevented that). Some racers push hard to a checkpoint and warm up there, but what if you don't make a checkpoint? I know that I would never venture out into the winter wilds for very long without something else. I even carried insulated overboots in case my feet got bad. Guess I don't trust my running shoe combo.
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