I didn't have time or money before our trip this weekend to go get a roll of Reflectix and measure/cut, etc... But we were staying at a big rv park at a huge "trade days"....knew it would be lots of concrete and sun! I went to Dollar Tree and bought 10 auto sunshades...they are foam with reflective silver backing. Stuck them in the windows...and even though they don't cover the entire window, by golly, they work! Ugly, maybe? But we are chillin' like villains in the only pop up in a sea of big rigs!