NOT 100% COTTON! These are not like the cherished 100% cotton socks of the 80's, these are more the like cheap version of the desired socks -  the version that had elastic and/or spandex to make it look like it had the natural folds of the all cotton socks (but didn't). 100% cotton socks don't have elastic thread running clearly through the sock (see pics). These have a lot of elastic/spandex/rubbery threads running throughout them, they are not all cotton (They may have some cotton in them, but not 100%). They also are too small for size 11 to wear with any wiggle room at all. All that being said, they are soft and do have extra thick souls that look like they would wear well (and they do slouch nicely).