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Title: It goes cold when needed most.
Review: I got the handwarmer as a Christmas gift to help keep warm while fly fishing. Unfortunately it works great indoors but as soon as I'm outside it goes cold. I'm sure I've got it filled properly and that it's started. It's very warm before I put it in my pocket. But once I put it outside it just goes cold. As soon as I bring it indoors it starts to heat up again. It's a real bummer because it's a great idea if only it would work.
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