Solar energy reaches the cabin as visible light, ultraviolet and infrared, and infrared carries a large share of the heat you feel without being able to see it. Kepler's nano-ceramic IR and IR+ films are built to work across that spectrum at the glass, rather than relying on darkness alone, which is why a lighter shade in the range can still make a noticeable difference to comfort. In a Tesla, with its large glazed areas, that shows up as a cabin that does not bake as fiercely while parked, less radiant heat on a long drive and less ultraviolet exposure reaching the interior. Performance varies between products and shades, so compare the exact film you are considering and ask the dealer which option suits your model and the windows you want treated.