Solar energy reaches your Tesla as visible light, ultraviolet and infrared, and infrared is the invisible part responsible for much of the heat you feel building in a parked cabin. Kepler's nano-ceramic films work across that spectrum rather than relying on darkness alone, which is why a lighter shade in the IR or IR+ range can still make a real difference to comfort. Reducing UV also helps protect interior trim and upholstery from fading and drying out under long exposure. Because performance varies by film and shade, compare the technical data for the exact combination you are considering, and ask your Kepler dealer which option best matches how and where you drive.