I dunno if I can post a link here, but here goes:

http://www.epcamps.com/Thermal_Protective_Aid.html

That's the site I was looking for. Obviously not built for mobility, but practical for overnight in nastiness? Might just be worth trying, of course I may be too tall for it (I really hate one size fits all claims).
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)