I change sides, and air them, but launder like everything else once weekly. They don't snag on the floor. They don't sag down on my skinny legs. I like that the seamless toes have an analogous sense to wearing stockings. I'm a size 8 and found the size M marginally https://garrettpkcvm.blogofchange.com/33044415/the-basic-principles-of-wright-socks