I actually purchased these for my Mom and sister who were in an automobile accident but I kept one for myself and have used it a couple of times. They love theirs and I like mine too. The Velcro closure is great. Keeps the cold on the area where it is needed!!
They are about the size of my hand. Only plan I put them is on my neck for headaches. I wouldnt recommend for lower back it wouldn't cover the spot you would need. Cooling affect is pretty good.
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