Works fairly well
I've had chronic back pain for years and have used a number of different pain products.  While the Kailo didn't remove my pain completely, I would say it definitely reduces it (but I didn't really notice much warmth).  For instance if my pain is a 5, it reduces it to a 2 or 3. Those that are saying that it doesn't come with instructions are wrong.  There is a nice little card that has step by step adhesive placement instructions on one side and where to place the Kailo on your body on the other.  The adhesive itself itself also has instructions so some people just are not paying attention.  I do think it loses some of stickiness if you sweat.  I also take it off before showering as I am concerned it would lose even more stickiness, but that's just my opinion.  I have to eventually order more adhesive so that is a downside of the product.
Rating: 3 stars