My best friend has Lupus and suffers from polymorphic light reruption - meaning that too much of the UV rays and she breaks out in large and painful sores. When she drove her car or rode with someone else she had to wear sun protective clothing and sunscreen at all time. Then she discovered Bobby's and a product called Luminar, a window film that blocks 99.97% of the UV rays BUT is barely visible on the windows. Bobby actually went to her house to apply the film to her car - and mine. Now we take day trips and ENJOY the sunshine. Great Job. Thanks, Bobby.