THIS DOES NOT WORK absolutely no change in color
From very mild to very harsh sun the color in the center did not change, I wore it on my drive to and from work with my arm out the window and in the sun the whole way. The final straw for me was after a 1 hour boat ride with it pointed right ay the sun, there was still no change in color, and the tester card i have, changes color within 3/4 seconds
Rating: 1 stars