From the weblink
reflects back 90% of your core body heat
More marketing silliness for the uninitiated.
and
a material similar to a "NASA space blanket" or Dupont Mylar®.
For some reason the NASA tag always seems to make it into the marketing for this type of product giving the product some sort of apparent amazing high technology discovery in fabric materials technology.
The 'Aerovest' (again even the name seems like aerospace high tech) looks like a vest version of the products produced by Blizzard Survival.
http://www.blizzardsurvival.com/product.php/101/blizzard_survival_jacketI suspect it will have the same advantages and disadvantages as the blizzard bag recently tested on the forum.
At $13.00 it is priced competitively and could be useful in an emergency, but why not just get a down vest or jacket instead. A down vest/jacket will be more comfortable, warmer and have a long life and will pack down further than this product after it has been initially deployed.
I guess the downy a**e feathers from a eider duck just don’t have that ‘NASA’ high tech image.
At least the Aerovest is Orange so you don't look like a foil rapped turkey ready for the oven whilst wearing one.
From the Website instructions
Do not inflate with helium or anything other than air gently added by breath.
(visions of taking off as the product name suggests)