I hadn't seen or heard of this here before, but I really like the idea.

Solatec Survival Vest

This could be a great little addition to a survival kit for cold weather. Having that pocket of air around your midsection ought to be a lot like a down vest.

Anyways, it looks worth it to me.
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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)