Day Night Vision Polarized Clip On Sunglasses Flip Up Lens for Driving Feature:<br> and high quality<br> Features<br> Transforms regular glasses into sunglasses.<br> Great for those who already have a pair of prescription glasses and do not want to spend more for a pair of prescription sunglasses!<br> Easy to clip on glasses (not suitable for rimless glasses)<br> Polarized lenses will be helpful for your safe driving or any other activities under the sun<br> How to choose the right size:<br> 1.With a ruler to measure the length and width of you glasses<br> 2.Select the clips should be larger than the size of the measured<br> 3.If you like a larger Polarized lens you can also choose larger size<br> Note:<br> 1 inch=2.5cm<br> Sells the commodity take the material object as the standard<br> 1.Due to the hand measurement, there have size error about 1-2cm<br> 2.Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the photo and the actual item could be slightly different