> reflective foil E.g. an aptly named space blanket. A friend once gave me a small sample of thermal insulation used for a satellite he worked on. It was sev

> reflective foil E.g. an aptly named space blanket. A friend once gave me a small sample of thermal insulation used for a satellite he worked on. It was several layers of metallised plastic (e.g. space blanket) with a very fine plastic mesh, almost like fine fishing net, in between those mylar layers to create small gaps between the metallised layers. I think it had about 10 layers like this.