It's hard to even think about next winter already, but by that time we might be donning new Phase Change jackets. Sounds like something out of a Marvel comic.

We have some hand warmers which work off a similar phase change using sodium acetate, but they need to be boiled to reset. Sounds like the jackets have a narrow operating range and don't need the little metal clicker to free the heat. Or maybe you get a couple of Cricket Clickers with the jacket?

Making your own handwarmer.

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