Although window film has been around for decades Geoshield products are different than conventional films. Geoshield uses advanced ceramic materials, similar to those used in NASA's Space Shuttle, to create a spectrally selective window film. This means that Geoshield has been able to produce a film that is virtually clear but blocks out harmful UV and heat. Geoshield nano-ceramic technology blocks specific wavelengths of infrared light and UV while allowing a high percentage of visible light to pass through. Geoshield films are made from high quality weatherable polyester designed to withstand extreme conditions. All Geoshield nano ceramic films are metal-free making them media friendly unlike metalized products that can interfere with your radio, cell and satellite signals. Geoshield will live up to its promise to "Block the Heat, Maintain the Vision."