Not bad at all. My pain is in the lower part of my lower back. This thing has a nice pocket for a gel pack that can be frozen or reheated. I prefer the cold and it is quite comfortable and lasts between one and two hours. I haven't microwaved it, and to be honest I don't think about heating it, so I probably won't. If you have lower back pain, this will help. It sits around your pelvic bones and provides support. I was semi active with him and he was helpful. I chopped some firewood and did other general household chores with it. I don't know if the copper supposedly has any meaning. I honestly think it's just a gimmick. But I don't mind it because it supports, forces good posture, allows for healing and keeps an existing injury from getting worse. I would do it again. There are no regrets here.
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