(5 Patches) CrampCareH PMS/Menstrual Cramps Relief Heat Patch with Wide Wings, FDA Registered

The principle is a chemical reaction between the powder inside and the oxygen in the air, it's actually burning but very very slow so it heats up to about 40-50C and stays warm for hours. It works exactly as a hot-water bottle but it's small so you can have it sealed in your purse at all times just in case or wear it all day long without anyone noticing. After 6-8 hours the reaction is finished and it cools down but you may remove it earlier and throw it away still warm, I'm pretty sure it wouldn't start a fire. I like that these patches are shaped like panties, other brands are usually rectangular. The only drawback is that the powder inside is a little heavy for the glue, so the patch may eventually fall off. Trousers would keep it inside, but I wouldn't wear this patch with a skirt. Read carefully the instruction and all the warnings about low-temperature burns and skin irritation. Never glue them to your skin.

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I like the item and it very useful and convenient

Lifesaver! worked great and eased all the pain while I was out and about and not able to be home with a heating pad. highly recommend.

I used this product and am very happy with its relieving benefits. It was delivered properly and arrived on time! :)