Buy Decorative Film's Natural 20 Daytime Privacy and Sun Control window film gives your window a classic, tinted look with its traditional, black shade. A little lighter in shade than our Natural 5 window film, the Natural 20 will allow more light to pass through but still offer high heat rejection and great daytime privacy. If you are looking for both high heat rejection and daytime privacy but something that is not extra dark, the Natural 20 can serve your needs. As this window film absorbs a lot of heat, it is not safe for dual-pane glass.