This works as intended. It relaxes and is very safe, I put it on 60 C and it worked perfectly. I have a pain in the left foot for years, using whatever you could imagine; something helped a little something not at all. This stopped the pain on first usage. I guess it will just be better on repeated usage. Other small pains here and there gone. I even placed it on different parts of the body just to find if anything is under the stress. As you can imagine, there were muscles under the tension that I had no idea about. Buying another one, what can I say. It looks to me as one of those: must have products in a household. Worth every penny even if it would work half the way it does.