Oakley Flight Deck Prizm Sapphire Iridium Lens is an all-round lens that you can use every day on the mountain. It has prizm technology, which emphasizes the colors and contrasts from the environment. The world's best lens technology. It is a mirror lens, so you can not see your eyes and Iridium coating limits the glare from snow and ice. Overall a lens that you can use every day on the mountain and always expect a good view.