I may have posted too quickly. I think this is a dead end. Sorry. This stuff is nowhere near 1/2 in. in thickness. I dont have a scale so no actual weight data. I did get warm when wrapped in it, but I was fully clothed, in my house, on my couch, with my daughter laughing at me. I really really wanted it to work.
Like any good inquisitor, in order to better understand something I destroyed it. Upon closer inspection, this stuff is more like Saran wrap with lint glued to it. I tore 1/2 in. square piece off the edge and it stretched, and stretched, and stretched. Very very thin. Once tore apart, I'm willing to believe ths stuff is some kind of paper dust stuck to a micro film of pe.
Oh well. I really wanted it to be a great find. I'll try to post a pic or video of my observation and destruction.