The first time I ordered compression socks, I measured my calves (twice, just to be certain) and ordered the appropriate size according to the size chart provided by the manufacturer. They were too small and nearly impossible to pull on. I gave all of them away. Considering myself a little wiser, I measured my calves (again - twice, just to be certain) and ordered the size LARGER than what the manufacturer's size chart recommended. I was expecting the socks might end up being too large and was concerned that they'd be too loose and that there would be no "compression". I needn't have worried. They were still WAY TOO SMALL. The only difference between the first order and the second was that I could at least pull on the ones from the second order. With a lot of struggle. But the compression was painful, especially at the top of the sock where it hits just below the knee. Therefore, I DO NOT RECOMMEND. Not because of poor quality but because the sizing is all wrong.