I have a 2007/08 Ford Expedition and live in the Houston area. I take the subway bus from where I live to downtown. So my car is parked in a parking lot with no trees or shade from 7am to 6pm. I already use one of the foldable windshield reflex screens but it doesn't help when the sun hits the sides of the car. I was looking for something similar for side windows. They are pretty cute and easy to use. When light hits the stars, they look like they're twinkling. I will say they help but I think if they had a reflective backing they would be even more effective. Also, they don't cover my entire window; maybe about 2 or 3 inches of clearance at the bottom to allow the sun to get through. On the first day, one of the magnets was pulled out of the material, but it still works perfectly.
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