I really like these socks and they last. I where them for aerobics and running. My issue with them as another reviewer mentioned is the sizing is not consistent. I got a small black and a small yellow. The small black was about an inch longer than the small yellow. That makes it very difficult to determine what size to order. I used these for achilles tendons that were inflamed until they healed (the FOUR height) and for added support for a previously broken foot (the ONE height).;