The film is made with static cling, so it can be removed very easily and won’t leave behind any residue. Plus, it blocks out 96% of UV rays, which will protect you and your home from being directly exposed to sunlight. It is also heat-controlling, which means it will keep your home warmer in the winter and cooler in the summer.
Promising review: “I’m really happy with this product. I have huge sliding door windows on the first floor, so I wanted to have some privacy but still have natural light. It was very easy to apply. I thought it would be like trying to apply a screen protector, which is frustrating, but since there’s no adhesive and the material is pliable; the bubbles come out very easily. The pliability also makes it very forgiving if you don’t cut it perfectly. I plan on buying more for my other set of windows! A few reviewers complained about not getting the rainbow/prism effect. It depends on the angle and intensity of the light. My windows face the setting sun pretty directly, so sunset is rainbow time! Season changing will probably alter the effect, as the angle of the sun changes a bit. From the outside, I’ve noticed that small lights in a dark room (ex: my digital clock backlight) produce pretty rainbow circles on the film.” —DMG
Get it from Amazon for $7.98+ (available in 10 sizes).