I purchased the clear-to-black photochromic replacement lens to utilize for most of my riding time in the fall/winter/spring of southern Oregon. I love how easily lenses can be replaced in the Oakley Jawbreaker glasses and the photochromic lens covers every base of my riding....sunny, cloudy, foggy, rainy, no matter what the weather this lens provides just the vision I want. This might end up being the only lens I will use year round. While the photochromic change in the color of the lens can never be instantaneous, I never notice the change in lens color...it just happens and it always appears to be just right. I love these lenses and glasses!