I purchased these for my husband.  He wears a size 13 shoe and most socks are to tight on his feet.  He has a hard time finding plus size socks in stores.  After getting these socks he wore them with his tennis shoes and some leather slip on shoes.  The the foot portion of the sock fit his feet and were very comfortable.  However, he couldn't get the socks pulled up all of the way because they were to tight on his calves.  I measured his calves and they are 17 1/4" thick.