Sunlight reaching your glass arrives as visible light, ultraviolet and infrared. Infrared is the invisible portion you feel as heat on your skin or radiating down from a glass roof, and it is the part that does most to make a parked cabin uncomfortable. The nano-ceramic layers in Kepler film are built to work on that energy across the spectrum rather than simply darkening the view out, which is why shade and solar performance are quoted separately. Ask your Kepler dealer for the data sheet covering the exact film and shade you are considering, so you can see how it behaves on your car before anything is fitted.
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