Sunlight reaching your Tesla arrives as visible light, ultraviolet and infrared, and the infrared portion is the part most associated with the heat you actually feel in the cabin. Kepler's nano-ceramic construction is engineered to work across that spectrum rather than relying on darkness alone, which is why lighter shades in the IR and IR+ ranges remain a realistic option. Figures differ between films and shades, so compare the exact product you are considering and ask your installer which range suits how and where you drive.
Ask a local tinter whether they carry Kepler film or can get it. For more information, see quick quote.