So I purchased a bunch of socks like these for high quality workout socks. I researched a bunch of ratings lists for running socks and these came up on all of them. I bought the size suggested and HATED them as they squeezed the crap out of my toes. I really don't like the sensation of squeezed toes. I gave them to my wife (who has significantly smaller feet than I do) and they fit her well. I then ordered the biggest size and they're much better. My feet are about 11, the L was good for my wife and her size 7, and the XL were fine for me.