I've used it for my knee in the past with varying success. Whenever my PT applied it, it would stay on 3-4 days, even through back to back long runs. And it seemed to help keep my knee cap in place tracking wise, which was good while I was still working on my IT band. However when I tried to tape it myself, I would lose the tape 3-4 miles in. At the DLR half last year stopped by the KT booth, and talked to one of their reps. He said the issue was the hair on my legs. Tried to explain that the generic stuff my PT used stayed fine, and he tried to sell me on the KT Pro vs the normal KT that I had just bought the massive roll of. Wasn't terribly thrilled with his answer. So I broke down and bought a razor that night and shaved the area I apply the tape to, and used the normal KT tape I had. And when I was running the race, it came off at about mile 5-6. So I'm not sure if my technique sucks, or if the normal KT branded product is inferior to the generic industrial stuff my PT used, but that was my experience. Now that I'm normally regular with my rehab, I don't use it at all anymore.