Day and night sport glasses: Photochromic lenses are based on the intensity of sunlight and uv lights, darkening the light yellow lenses.It is not always dark like ordinary sunglasses,which affects the safety of vision and driving. The reason why it is superior to ordinary sunglasses-when moving indoors or in low light, the lenses will automatically adapt to the reduced lighting conditions and become light, so as to adapt to your eyes and make your eyes see more comfortably and clearly. UV400 anti-uv polarized lenses: 100% UV400 protective coating can block harmful UVA and UVB rays and protect eyes perfectly. Tac yellow polarized lenses can reduce glare caused by road, water, snow and automobile LED lights, improve the brightness of dark places on both sides of the road at night, and the visibility is improved in rainy and foggy days, which make the visual field wider, clearer and safer. Classi Sturdy and durable flip up clip: Constructed by precision engineered spring bridge ,ensures smooth, solid and durable flip up that won't break or stick. Each leg of the clip has a rubber sleeve to prevent shifting and scratching glasses. You can turn it up when you don't need it, saving you the trouble of taking it off. And no clip arms will in the corner of your vision. Ultra-light design: Weighing only 8g. Just like never wearing them, you don't need to wear two pairs of frame glasses.