Forums >Gears and Wears>Foot/Hand Warmers
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Part of how they work involves a chemical reaction with the air, so to get them really working leave them out on the table for 10 or 15 minutes before putting them in anything. And for the ones for your feet, they work better (i.e. stay hot) on the top of your foot than on the bottom. Of course, it's always your toes that get cold, so people tend to use them under their toes - which is why most people think they're useless. Not as much airflow there.