Reflectix® is. your friend
I had never heard of Reflectix®before I became a nomad, though I had—as most of you likely have—seen it before. The most common way to be introduced to it is to see one of those shiny, metallic-looking, lightweight accordion-style windshield sun shades. In fact, I’d owned a couple of these when I learned that the material out of which they’re made is called Reflectix.