Normal hand warmers get warm enough to leave second degree burns on human skin. Trust me, I've gotten them, working football traffic in two feet of snow doesn't stop those things from being destructive.
The duration is another thing to consider, typical hand warmers last about 8-12 hours. The 40-hour packs approved by SYR cover contingencies like the package getting lost, hopefully only for an extra day.
In either case, with temps the way they are now, best to wait til it gets above 40 overnight, especially if the parcel has to travel by plane. It gets much colder up there.
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yep, that is what we are doing! just sucks waiting.
Originally Posted by Archimedes
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