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Used these during a late-night football game and the heat stayed steady the entire time, right up to the 10-hour mark. They’re lightweight enough that I forgot I was wearing one, and each packet held up even when I was moving around a lot.

Wore one to an outdoor concert last weekend and it held up the whole night, easily the full 10 hours they promise. The heat was steady and even, not that weird burning-then-cold thing you get with other warmers. Glad I grabbed a pack before the season really hits.

I was skeptical about the 10-hour claim, but I put one on before a long outdoor shift and it was still radiating heat when I got home. The packaging is neat and compact too, easy to stash in a coat pocket. Definitely stocking up for the rest of winter.