Silver tone high performance solar films . UltraEco is a fully metallized mirrored window film that prevents large amounts of solar heat gain, it is very cost effective, yet boasts high quality and performance, along with a life expectancy that will outlast a generation. Its down fall would be its high internal reflection that creates a mirrored appearance when the sun goes down. It is used almost exclusively in the commercial sector for large scale installations that require heat rejection first and foremost, usually in buildings that are rarely occupied at night. The ultraEco external film is designed to be installed on the external surface of the glass where internal install is not possible.