Maui Jim wants to make sure you can see everything you need to when you're wearing the Switchbacks Interchangeable Sunglasses, which is why the Switchbacks Replacement Lenses have different tints please see size chart for information on lens tints to accommodate to any condition you might find yourself in. All the tinted lenses feature PolarizedPlus 2 technology to eliminate glare and block UVA, UVB, and UVC rays from the sun. This technology also features a multi layer design that maximizes color transmission and minimizes distortion. Maui Jim coated these polycarbonate lenses with Clearshell's scratch resistant protection to keep the Switchbacks looking sleek and scratch free for a long time. The lenses also have an anti reflective treatment for comfortable viewing in any light.