I bought the ThermiPaq Therapeutic Hot & Cold Pad to use for my back/neck pain and migraine headaches. It has been a lifesaver. I keep one in the freezer at home, and one in the freezer at work for when I feel a migraine headache coming on. My doctor had suggested icing my head, which works, but using ice in plastic bags can be a pain. The Thermipaq consists of a clay pack which is inside a soft cloth with velcro. It gets nice and cold in the freezer, and is a lot easier to use than ice cubes. It truly helps with the pain. To relieve a sore neck and back muscles, I heat the pad in the microwave. It has a strap with velcro that you can use to keep it in place. One note of caution--since the pad underneath the soft purple cloth is made of some type of clay, it will burst if overheated. I found this out the hard way when I put one in the microwave for too long, and it broke. The directions clearly say not to do that, so it was my own mistake. Effectiveness Works great. Ease of Use Just put in freezer for cold, or microwave for heat.