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What’s the logic behind that?

Black socks were associated with dress socks. Wearing dress socks at the gym used to get you weird looks.

Now, anything is fashionable.

It's probably not logical. They are hinting at increased sweating.

Ahh, no problem. I always shower after gym and I wash my feet, including between my toes.

On that note, a surprising number of humans do not wash inside their belly buttons, so life optimization tip number 5. Wash your belly button.