I bought socks similar to these a few years ago to wear at night and loved them.  I thought these were the same socks.  Apparently they are not.

When I received them, I washed them before wearing them and then wore a pair at night.  In the morning, my feet were broken out with hives.  I do not have sensitive skin or any medical conditions of any kind so I have no idea what is in these socks but something is terribly wrong with them.  So I stopped wearing them for a few days and my feet got better.

Then I tried to wear them again and once again, my feet itched like crazy and my ankles had these massive bumps all over them.  I've now tried to wear them 5 or 6 times since purchasing them and have had the same reaction each time.  I've washed them in hot water several times with an extra rinse cycle.  Yet I'm still having some kind of allergic reaction to them.  I'm young and healthy so I have no idea what is in these socks but I do not recommend buying them.