After reading an article about the amazing material AeroGel and it's insulative properties I thought "I wonder if an aerogel jacket would be lighter than down for the same warmth?". I did a google search and found a company that makes a jacket with AeroGel but it doesn't have a lot of information.. here are the links:
AeroGel is the insulation used by NASA when they insulate uhh "space ships" :)
Apparently it's pretty expensive so a jacket worth it's "weight" might be a fortune but we ultralighters are known for sacrificing a lot of money to shave a few ounces ;)
Has anyone here heard of AeroGel used in any other garments?