Solar energy reaching your car arrives as visible light, ultraviolet and infrared, and infrared is a large part of the heat you feel through glass even though you cannot see it. Kepler's nano-ceramic IR and IR+ films are built to reduce that solar heat load along with glare, and to block UV that fades trim and upholstery over time. Because the ceramic construction does the work rather than the darkness alone, lighter shades still perform, which is useful on a Tesla with a lot of glazed area. Visible light transmission describes how much light passes through and is separate from solar heat performance, so compare the exact film and shade rather than judging by appearance.
Did you know we also have information on California window tinting regulations? View our guide on tint laws