I bought these socks because I am allergic to the elastic in regular crew socks.  I purchased the correct size based on my shoe size.  They are so big--the heel is at my ankle.  I do realize because there is no elastic to keep them up that they will sag a little, but they stretched so much that the top of the sock was about three inches bigger than my ankle.  They do not fit and I would never recommend them based on my experience.