I purchased a set of these socks several years ago. I wash them in cool water and let them air dry. They wear like iron and still look new. They are warm and comfortable. My lower legs tend to swell and these socks do not leave marks (indentations) on my legs, yet the socks do not slip down on my legs either. These are my "socks of choice" during the colder months, so I decided to purchase a second set. The second set of socks are longer at the tops, so I like them even better. The socks all have an "L" knitted into them. I am not sure if the "L" is supposed to designate the left sock or not, but that doesn't really matter to me. Just noting that for someone who might care about that detail. Otherwise, these socks are wonderful. I would definitely purchase them again.