I don't know why it is so difficult to find 100% cotton socks.  Thanks to this seller for making them available.  I bought two packs.  The socks are light weight, ribbed and about come just below lower calf length.  They are medium length.  I fold them to wear as gym socks.  FYI if you plan to wear them folded they have to be double folded for smooth look.  The top of the sock is more snug than the body of the sock and if you fold them just once the difference between the top and middle of the sock is evident.  They keep their shape and keep my feet dry and cool.  Love 'em!