How Reflective Windshield Sunshades Actually Block Cabin Heat

Reflective windshield covers work by bouncing incoming sunlight back through the glass before it converts to heat inside the cabin, rather than absorbing it the way a plain fabric shade does. A separate UV-resistant coating addresses interior fading and cracking over time, which is a slower-acting problem than heat buildup but affects dashboard and upholstery longevity just as much. Fit against the glass matters for how effective the reflection is, and a foldable design keeps the shade practical to store rather than becoming an item that gets left in the trunk and forgotten.