This circulates ice water, keeps it's cold for hours. This is a much for a recovering joint replacement patient, and for those who would benefit from any ice pack bigger than the small size. Kept my husband from needing pain pills during the day after 2 knee replacements. The tubing will start degrading after a few years, and then I'll buy another.
I purchased these for our summer campers. I tried one first at home, so we wouldn't be surprised with its performance when we had to use the first one on a hurt camper. Much to my happiness, the cold pack was definitely cold!
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