I can take my water bottle and was suffering badly untergwegs often from back pain as a result of vertebral blockages, finally had to be a low-cost heating plaster. The application on the back was easy and after a while a pleasant heat generated holding really long. I wear the patch for half the day, and take up again the pain was heat. The poor adhesion I can not confirm, even after 8 hours it sticks more to the right place without detaching somewhere. Why is it at other not so I can not say. I am slim and wearing the patch between the shoulder blades, may I move it in everyday life thus less.
