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Then why do they exist?
if you didn’t wear socks then you’ll have to wash your shoes daily or risk getting something like a yeast infection of the foot or athletes foot.
Right, so what Boomer already said.
Warmth, protection, hygiene.
If you were born the only person on earth, you would eventually have something like socks on your own accord. This is function, not social. They wouldn’t be Xmas themed though, since no society exists to have invented Xmas and to show off your socks to.
Social constructs are, by definition, ideas or concepts.
The guy they found frozen in a glacier in the Alps had grasses stuffed into his moccasins as primitive socks.