These work really good for me as intended, they stayed warm a really long time (at least ten hours) in my vest and jeans pockets even after putting them up overnight, felt good in this early 29 degree weather. Felt more heat with thin layer of fabric between skin and the warmer.
Had hoped to use some as oxygen absorbers in 5 gallon buckets with Gamma Seal Lids but they seem to have to much water in them. Put two fresh ones in a quart jar to test, it sealed but steamed up a bit.
They contain Iron, water, cellulose, vermiculite, activated carbon and salt.
I used lots of these while catching the northern lights in Ester, Alaska. Stuck them in every pocket I had while we went out at midnight to 2am, viewing the auroras dance in the sky! It's important to have spares just in case you want to stick them in your gloves too, especially when it gets to -10 degrees F outside.
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