Smith Skyline XL Black / Everyday Green Mirror Goggles is a medium to large goggle with an oversized look and tremendous vision. Of course with Chromapop lenses as standard. Chromapop is Smith's patented lens technology. Made sure that you can see more, highlighting the contrasts in the snow, by helping you with what the eye has difficulty. Namely to see those wavelengths where blue and green, and green and red cross. It provides more definition and clarity. Green Mirror is an all-round lens. Perfect for most types of weather, whether it's cloudy, bright sunshine or in between. So will you not hassle of assessing which lens is best for today's trip to the mountain. So you keep just it on.