works great if you ignore the instructions.

Reviewed by LoveTheOutdoors from West Virginia on Saturday, January 11, 2014
These warmers worked great, as long as I shook them for a few minutes and let them sit for like 10 - 15 minutes on a table or counter before attaching them to my sock and putting my boots on. The instructions say shaking isn't necessary but I found them pretty useless if I didn't. But as long as I shook them, they worked great.
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