Howdy everyone! I'm thinking about how mylar type space blankets work, and would be grateful for any thoughts you might have. I'm wondering if there would be any decrease in performance in retaining heat by featuring a layer of fleece material between the mylar layer and the wearer. Specifically, if I were to sew a fleece backing onto the mylar side of something like the Grabber outdoor tarp, would I lose any of the heat trapping properties of the mylar? Thanks for your feedback.