Big Hug Self-Heating Patches by Popmask: Air-activated heat patches that the brand says give up to 12 hours of steady heat for period cramps. Price: $10.99.
Air-activated heat patches that the brand says give up to 12 hours of steady heat for period cramps. They are thin and stick to clothing or underwear, not skin. The page lists iron powder, water, vermiculite, activated carbon and salt.
Per Popmask's product page:
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