For comfort, 5 stars, for washing, 4.  These are great sox if you know what size to get.  I was in-between so I got a medium which was too tight.  I stretch them when I wash them and hang dry them and this helps.  I am ordering a large next time and I think that will take it to a full 5 stars.  These are very comfortable especially in the heel where I need it most.  I have server nerve damage to my heel and these help tremendously.  They have spandex in them and by the end of the day, my feet are a little sweaty from them, but overall, I highly recommend them.  I wear a 9 shoe and bought the medium, not remembering that my feet have flattened over the years.