The heat you feel through a window arrives as part of the solar spectrum, and a large share of it is infrared energy you cannot see. Kepler's nano-ceramic films are engineered to manage solar energy across that spectrum, including the infrared region, which is why they can reduce cabin heat without relying on a very dark or mirrored finish. Ultraviolet filtering also helps protect seats, trim and the dashboard from sun-related fading. Because the ceramic construction does the work rather than the shade alone, a lighter film can still be a strong performer, so compare the exact film and shade when you weigh up options for your Tesla.