If you look at your foot, you can see more veins near the surface of the skin than you would if you look at your lower leg because there is far less fat or muscle. With all those blood vessels near the surface of the skin to help transfer heat/cool between the blood and skin surface, feet are great temperature regulators.
It is about the flux.
If you are storing heat, you will feel hot.
If you are loosing heat, you will feel cold.
Temperatures almost don’t matter.
Take a steaming hot shower, when you’re done get away from it, you will feel cold even though your place is ar room temperature. You’re actually loosing some heat.
Take a very cold shower, you will feel hot because you’re storing it.
If you’re close to not loosing neither storing, you will just feel neat.
Putting your foot outside the blanket just makes you store less heat. Plus yes feet have a lot of blood flows that helps the thing.
The soles of your feet have plenty of blood circulating through them, this combined with our feet’s double-water pores and increased amount of pores per cm^2 makes it easier to shed heat through perspiration. Water is incredibly good at temperature regulation because of the energy required to heat and cool it to different states
Our palms and soles have an increased amount of sweat glands to provide greater friction with surfaces, our soles with ~600-700 pores per cm^2.
Edit: can’t find a source for the “double water sweat glands”, but I recall seeing something about it in a PBS documentary comparing humans to other primates, more specifically how sweating more efficiently may have given us the evolutionary advantage
To quote *Moby-Dick*:
“We felt very nice and snug, the more so since it was so chilly out of doors; indeed out of bed-clothes too, seeing that there was no fire in the room. The more so, I say, because truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself.”
Coz they are literal heat sink. Think of hairless skin patches on body like foot soles, palms and facial area that don’t grow hair as heat sinks in machine that need to throw away extra heat. Body is never not burning calories and thus constantly creates heat which is also why balls are outside so sperm don’t die of heat.
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