I use these for small wounds or joint heat
Verified Buyer Reviewed by AnnaLaurie from Arizona on Thursday, January 22, 2015
All the little warmers I get from Sierra are good for what they are advertised, though I have been using them to, say, warm an injured joint. I keep one in my first aid kit for that purpose. I haven't tried these in my shoes, but I can vouch for the fact that they stay warm through a night, when bound to an injury.
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