Get Every Performance Advantage Possible: From the superlight frame down to the nose piece, these frames are flatter than most performance eyewear for a secure feel when you’re going your fastest Geared for Speed: With durable TR90 frame material & TPU construction, adjustable megol nose pads & non-slip temples, the ShiftMAG will stay in place whatever your next challenge Includes Interchangeable Second Lens: Easily switch lenses to suit any light environment; take on exposed trails or dark, wooded jumps with the included Photochromic lens or switch to the included secondary clear lens for low-light situations Perfect for Any Light Environment: The photochromic lens reacts to whatever light conditions you're in, transitioning from light to dark so you can see more of the mountain while riding Born on the Mountain, Built from Innovation: Smith is a performance eyewear and helmet brand for those inspired to pursue new and deeper connections with the outdoors; we’ve been outfitting consumers with the confidence to experience more since 1965