These are excellent no show liner socks.  First, I have to say that they stay on my feet where many liner socks have a tendency to slip down into the shoe.  I love that they are mostly cotton and do not cause my feet to get hot and sweaty.  They come with washing instructions which recommend that you machine wash and air dry.  I usually do this; but on occasion have forgotten and put them in the dryer.  They were fine.  (I don't use my dryer on the highest heat).  Most often I just sit them on top of the dryer to dry.  So far, they are the best that I have found which is why I gave them five stars.