Find FF FRAZALA’s Features And Benefits: 1. Cool Fashion Classic Clip-on Flip up design for sports and outdoors activities lovers 2. Anti-reflective lens coating can relieves eyestrain 3. Cuts glare from streetlamps and headlights 4. Clip on sunglasses with case, easy to carry 5. Polarized lens help eliminate reflected and scattered glares 6. Ten patents of night driving functions, effectively enhance driving safety at night 7. Wears comfortable, 57% lighter than traditional glass 8. Perfect for night driving , golf, cycling, running, fishing and other outdoor activities 9. Great fashion design polarized sport sunglasses clip-on for ski, golf, cycling, running, fishing, driving and other outdoor sports activities 10. Say NO to expensive Prescription Sunglasses 11. 30 Days Money Back Guarantee Compact Flip-up Clip-on Sunglasses: ★You can flip it up when driving into a tunnel or when temporarily not requiring shades. ★You can flip it down when you need sunglasses at any time. How toTest Polarized Lens: 1. Put the glasses in front of LCD screen and look through the lens. 2. Turn the glasses 45 degrees. 3. You will notice the color has changed. The light coming through should have been blocked, this means the lenses are polarized. 4. Note: Only the yellow night vision lenses are for regularly using at night. 5. Or only use one polarized test card. How to select suitable clip on sunglasses: 1. Measure the height and width of your glasses frame. 2. Compare the measured data to the clip data and select the clip which is a little bigger than the glasses.