I used reflective windshield covers for a car that I bought at a big box store for $5. I just cut them to size and bought some clear round "button" style velcro tabs to secure it to the skylight and my shades actually hold it to the bedroom windows so no need to secure it there. Huge huge difference. The camper stays a little cooler but my main reason was the light. We have a skylight and 3 windows in our bedroom with no curtains. I used to hate waking up because of sunlight. Those days are over. It's nice and dark in there now.