The 3M Crystalline film is a multi layer optical film that combines 200 layers and is thinner than a Post-It Note. What this means is that this film offers a higher heat rejection than some darker films so that you don't need to change the appearance of your vehicle to keep it feeling cooler. Solar heat primarily comes from two different sources, the amount of visible light you can see and infrared light which you can feel. The 3M Crystalline series blocks out 97% of infrared light at rejects 34% heat at it's lightest shade (CR90, about 86% light transmission)
To sum things up, Crystalline films are designed to reject infrared light and a fairly high amount of solar energy for having lighter shades than other Ceramic films. If you're not looking to change the appearance of your vehicle while keeping out high amounts of heat, then I would highly recommend the 3M Crystalline Series.
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