Just wish to feedback this very helpful. I used it 3 times a day. We have all recovered now but long drawn mild symptoms lingering for some of us. I am so glad I bought this mat. Originally intended to be for my office chair, but no chair in my house fits the mat structure. However it turns out to be a bed lifesaver during Covvid. It helps the body emotionally and I could feel the immediate difference the heat made instantly. I just hope to learn how to use it even better henceforth. Right settings seems tricky.