Hello, I use it for several days heating pad and I can say that it does much good to my trapezoids and my neck, I warms during 1m30 in my microwave after that will depend on the quality of your microwave, a only downside, in sitting position the cushion does not cover the neck shoulders just so, it would then get in lying to heat the neck, holds heat long enough and no unpleasant smell after commissioning Product heater, I would even say that it is odorless, one last point for people who will wonder which side should we put on the shoulders is of course the one in red fabric for my cushion. Why 4 stars and not 5, I would have wished it to be a little wider to cover the broad shoulders and the fact that it does not cover the neck while sitting. In summary, I recommend this product that was delivered earlier than scheduled in proper packaging, instructions for cons is poor information.