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The Skin Cancer Foundation has released an article about the benefits of window films that are designed to block UV rays. UVA and UVB rays are what cause sunburns and eye damage. Conventional glass blocks the transmission of UVB radiation, but UVA rays can pass through effectively unhindered. These protective films can block up to 97% of UVA rays. Unlike traditional films, many of these UV-blocking films offer excellent light transmission characteristics. As much as 93% of visible light can be transmitted, making them suitable for use on windshields in some areas. The best of these films offer an equivalent Sun Protection Factor (SPF) of up to 1,000. If you spend a lot of time in your vehicle, then you should look into UV-blocking films.