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There's an ampule inside them. Bend until you can hear the ampule break, then shake them to start the chemical indothermic reaction.

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Q: How long do gel packs stay cold?
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Is deoxidizer the same as silica gel packs?

No. Silica Gel packs remove moisture. Deoxidizer packs remove oxygen.


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I know, to get rid of back pains is not that much easy, but you can get relief from the back pains by first identifying the exact cause. Because without knowing the reason for back pain problems, you cannot go for the treatment. You can do some light-weight exercises to enhance your body's elasticity. Sometimes, the reason for back pain is longer setting hours, sports injuries, accidents, etc. You can get rid of your back pains by applying hot and cold therapy, all you need is to have hot and cold therapy packs. These gel packs contain gel inside it. You can microwave it or freeze it before use. Apply the hot gel packs on your back for 20-30 minutes thrice a day. But before applying the gel packs, you need to wrap it in a warm cloth or towel. Otherwise, it can harm your skin.


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