These are game-changers!
Verified Buyer Reviewed by Nori from Montana on Friday, January 1, 2016
If you have trouble with cold toes, these WILL fix that problem! I've relied on these for years at temps down to -60. They give you at least 4-5 hours of good heat then gradually taper off, but it's quick and easy to put in a new pair. They're about 3/16" thick so there's plenty of room for them inside properly sized (very roomy) cold weather footwear. If you're planning to use them in really snug ski boots or snug-fitting dress shoes, it might get pretty tight in there. Advise you don't buy more than 1 year's worth, since even if you store unopened packets in airtight vacuum bags in freezer they'll lose about half their effectiveness.
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