All lenses have a UV400 protective coating that blocks harmful UVA and UVB rays to your eyes when outdoors. Different lenses have different functions: GREY lens is perfect for working on rainy days; Yellow night vision lens is perfect for working in night, cloudy or other dark environments; Dark green polarized lens eliminates reflected glare on surfaces such as water, snow and road; Brown solar polarizer can filter out a lot of blue light and improve visual contrast and clarity. Lightweight design is perfect for motorcycles and bicycles, biking, cycling, driving, running, fishing, racing, skiing, climbing, hiking or other outdoor activities. Ergonomic design makes it ideal for everyone as it fits the face. They are ideal for outdoor sports, as their slim frame design generates a wider view.