I purchased these after reading about them in a health and fitness magazine. I read the one review that was done at the time and followed the advice: they run very narrow. So, I ordered them in wide and they fit perfectly, even though I usually wear average width. I work out a lot, and was skeptical. After wearing them to work on "Dress Down Friday", my legs and calf muscles were sore as if I had had a strenuous workout. I was amazed. I've used them on long walks, and other Fridays at work and am very glad I bought them.