Solar heat arrives as visible light, ultraviolet and infrared. The shade of the film handles visible light, a UV-filtering layer deals with ultraviolet, and infrared is addressed by the ceramic nano particles built into our ceramic window tinting. Because the IR and IR+ ranges use a multi-layer construction, solar performance does not depend on the film simply being dark, which is why lighter shades stay worth considering.
Ask a local tinter whether they carry Kepler film or can get it. For more information, see quick quote.