Why do socks get hard after wearing them?
the sweat from your feet dries up leaving only salt, which makes a layer of crust.
This doesn't happen to everyone only people who have profusely sweaty and stinky feet. The salt that comes out of someone's feet when they sweat a lot hardens when the sweat dries making your socks crusty. Gross dude!
i am not exactly sure what causes that. i guess when you wear them enough times they get so dirty and worn that they get molded into the shape of your foot. mine do that every so often.