In the hospital they use a device similar to this one. After working out my knee, they applied the ice pack for swelling in my knee. This system continually runs ice cold water over the knee but when you go home, you have to come up with your own way of an ice pack. This Machine keeps your knee cooled down for hours without you doing nothing except for filling the compartment with some water and ice. Sit back and relax.
Good size, flexible. The 5" x 10" size just fits inside a gallon plastic zip type bag. You can fit in two for larger areas like your back. The gel makes them flexible for use on different areas of the body, yet they get cold enough to use to keep food or medicine cold during transport. Good size cold pack for the wrist or head, too. I use them mainly as cold packs, but I gave two to a friend with back problems, she uses them hot or cold as needed and likes the flexibility of the gel rather than as a solid piece.
I have a bad back, and use ice frequently to relieve pain. Riding in the car for more than a few minutes and some regular daily activities cause me pain. These packs are durable and I carry some with me in the car at all times. They numb quickly and it seem to me better than refrigerator ice packs. They last about 15-20 minutes, so they keep me within the 20-25 guidelines for ice therapy.
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