>>>> Super-saturated salt solution. ;-) Just in case.
>>>  And that'll keep you warm how? ;-)
>>
>> Because, old chap, when I snap the small metallic band, the entire 
>> solution will crystalise, releasing heat. >:-D
> 
> Oh one of those, I get you now; I was thinking of some sort of ultra 
> de-icer. Those are quite neat I picked up three on some trip, they also 
> had huge ones to put behind your neck too.

Neat, eh?

[Actually the ones I have are infuriatingly reluctant to work properly, 
but still...]

Plus, every time you say "super-saturated salt solution" you get +4 
aliteration points! :-D

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