Dubbed the Aerogel Puffer, this jacket is made from the lightest solid material in the world, which is utilized to line spacesuits and insulate electronics. The jacket is pretty lightweight since Aerogel is made of individual neoprenes that are 10,000 times thinner than human hair.
The jacket itself has advanced synthetic insulation and its outer shell uses ultra-lightweight yarn so that you'll be protected from extreme cold weather (even -30 degrees!). Still, it also won't weigh you down totally.
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