i originally received a free sample of the power tape in a goodie bag after the Rauceby Ripper race and since then I have purchased additional packs. I think they are great and as far as I can tell, they work! I used them to help recover from a calf injury and while it may be psychological, I feel like they helped me. I felt better with these on. Very simple to apply and they will stay in place for a few days. No need to remove them in the shower or anything like that.