Multilayer polymer interference mirrors are based on hundreds of 10- to 200-nm thick, simultaneously produced layers of high and low index materials. The low absorptivity of the polymers used in these mirrors lead to very high reflectivity and excellent wavelength selectivity. Currently, the mirrors are being applied to reflective polarizers for displays, and cold and hot mirrors for solar control. New products are being developed for applications in laser protection, optical communication, and optical filtering applications. The design of filters based on multilayer polymers has additional degrees of freedom compared to PVD filters, including the ability to specify Brewster's angle from anywhere from 0 to over 90 degree(s), suppressing side-band reflections, and suppressing 2nd, 3rd, and 4th order reflections.