It is good when you find out window film can reject about 99.9% of Ultra-Violet (UV), which may cause darkening of skin pigment, skin aging, and skin cancer, due to cell mutation. Besides, all kind of plastic material (polymer), pigment and dye will be degraded by UV ray and cause color fading. Thus, window film can protect your car interior all plastic material for longer lifespan and always look like new.
However, window film which can reject 99.9% of UV ray, does not means it can reject most of the heat. UV ray only contribute 3% of total solar energy.
If you interested to know more about UV ray can visit the link below:
http://raytech.com.my/how-good-raytech-fil...harmful-uv-ray/
http://en.wikipedia.org/wiki/Ultra_violet