There are so many different brands of these things that I can’t even begin to tell you what kind you might find in your neighborhood. My local ACE hardware even carries them. But they’re all pretty much the same thing. When exposed to air, the packet begins to warm up. You slip them in your pocket and keep your hands on them in between shots.
But I don’t really like them. I find that none of the brands that I have used heat evenly throughout their usage period (usually several hours). Sometimes I’ll wrap my hands around them and feel nothing. At others, they’ll feel like they’re burning a hole in my pants pockets.
I like the idea though. But I’m still looking for a brand that actually works.
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