[Silver]
[Photochromic Clear & Smoke]
[dark smoke]
[Smoke Red REVO]
[light smoke]
[clear]
[Clear Red REVO]
[blue revo]
Please look at the product video before making your judgment. Photochromic Adaptive shields not only do you have to carry multiple shields but also allow you to actually improve your vision by seamlessly adjusting to the optimal level of darkness according to light changes. 2. Photochromic shields work by activating the shield darkening molecules by the UV rays in the sun. UV rays let clouds through, so photochromic shields can be darkened even on cloudy days. No direct sunlight required. 3.How do I change? Photochromic shields are known to be faster and darker than they become brighter and their speed is slightly depending on temperature. But if you are really bright and sunny days, it usually takes about 20 seconds to reach maximum darkness. 4. Photochromic performance is affected by temperature, UV radiation and riding posture.