4 Pcs Reusable Snap Heat Pack,Hand Warmers Click,Pouch Gel Hand Warmers Cute Long Lasting Warmth for Camping

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Heating packs can be very helpful in soothing tired muscles and relaxing tight low-backs. These are great because they are instant (no microwave needed), just click the metal button inside and the chemical reaction releases heat immediately that lasts for an hour or two. And they are reusable - simply boil them until the crystalized material turns to a liquid again.