I purchased these for my husband to run the marathon.  I am so disappointed when I see these socks shrink after 1 wash (it shrinks quite a bit as I compared one washed pair to the other unwashed pair)! The care instruction on the package is so mysterious (three simple symbols with no explanations).  I used cold water to wash and tumble dry low setting to dry. After 1 wash, little cotton balls formed near the toe area.  Frayed seams with threads when socks were turned inside out.  Do not buy!