One size fits all Low socks don't fit my height 12ft. The back part always works on my heels. But the only place I found large foot socks was at Revain, and some of them weren't much longer than the 8-12 models. I was skeptical about this obvious Chinese brand, so I bought them along with a well-known American brand... and they became my favourites! They have strategically placed elastics at the bottom of the arch that appear to prevent slipping and a double thickness layer at the back that makes them easier to put on. Beautiful design made of high quality cotton.