I intended to do this with the thinnest foam insulation. I got some 3/8" sheets, and ripped strips from it. Then I was gonna fasten them using Command Strips with Velcro, so they can be relocated each year.
I am definitely impressed with the cardboard version! Even thinner and flatter, and easier to store!
I am definitely impressed with the cardboard version! Even thinner and flatter, and easier to store!