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I've always found foot warmth to be as subjective as diet: one person's requirements can be wildly different from another's in the same conditions.
I know this because I am probably among the luckiest humans alive for foot warmth. My feet are hot in almost anything, and I have to work hard to manage heat and sweat. In the summer, I delight in the day's first tramp through an icy creek -- because I know my feet will be pleasantly cooled for the rest of the day.
I once misguidedly applied what works for *me* to my girlfriend: I suggested that gore-tex shoes would repel occasional splashes of water but create and then trap torrents of sweat, leading to wet and miserable feet. As most women reading this have guessed, she wound up with permanently-chilled feet and ultimately a bladder infection. We quickly exchanged her breathable trail runners for sealed-up gore-tex light hikers, and she's been comfortable ever since.
I feel that winter and high-altitude pursuits are where it's most critical to "know thyself". You need to know when and how *you* need to be fed, when *you* are ready to really giv'er, (or when *you* are spent,) and very importantly how each part of *you* needs to be insulated or ventilated.
Another climber looks at this list and says "yikes cold feet!", whereas the author might look at that climber's list and say "I would starve eating all that starch and candy" or "how are you going to stay warm at night in that bag?"
Nosce te ipsum.
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