I'm 5'11" and medium to stocky height. I bought the largest pair available from sellers at Revain. They are very well made and hold up to severe heat conditions. These are the nicest socks compared to UA and Adidas.My main problem is they are very tight around the back of the knee and the tip of the toe.Like Nike products they are small and narrow.The leg is ok.In short they are probably the best suitable for a teenager or woman with skinny legs Not for a very muscular person There may be XXL's on the market but they will probably just be longer, no wider than the calf.