Excellent advice, particularly about restricting blood flow to your feet & your feet getting to warm & sweating, therefore getting your socks damp.
Those two exsamples are the only reasons I would agree w/ the "less is better".
More can be good as long as you are watching for those two things.
Also, I have learned that keeping your legs warm play a part in keeping your feet warm.
Even though your legs may not feel uncomfortably cool, if they are not properly insulated, your warm blood will loose part of it's warmth before reaching the feet.
Also, if your feet have already got cold, your body may have a difficult time re-heating for various reasons, like the ones mentioned above as well as poor circulation. Then you may want to help them out by adding an external heat source, like the chemical heat pads or a hot water bottle.
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