Polarized UV400 protection; These polarized clip-on sunglasses for men and women offer exceptional glare reduction, making them an ideal sunglass clip on for eyeglasses during intense sunny days Please measure carefully; Your glasses need to be similar in shape and size; The clip-on sunglass size needs to be the same as the measurement of your glasses or the next size up Clip-on sunglasses must be the correct size for your glasses, avoid clip-ons that are too small or too big as they may not attach properly; Expandable spring bridges for secure fit Not only do these polarized clip on sunglasses offer superior UV400 sun protection, but they are also incredibly lightweight, making them ideal for all-day wear Our sunglass clip-ons stay securely in place, even during outdoor activities; Included microfiber cleaning lens carrying pouch for clip-on storage and to clean the lenses Slim rectangle shape clip on sunglass with polarized lenses. Polarized lenses are lighter weight on your eyewear glass frame and polarized lenses eliminate glare. For the slim rectangle shape to fit your glasses, your glasses need to be narrower rectangular shape with your frame rim measuring less than 3mm's thick. Measure one lens of your glasses carefully to the outside rim of your glasses width x height. We have many different sizes available and only one will fit your glasses, so it is very important to measure your glasses correctly. The slim rectangle shape needs to be nearly the same shape as your glasses and the size clip-on sunglass needs to be the same as the measurement of your glasses or the next size bigger. All of our sunglasses and clip-on's are rated UV400 protection which is up to 100 Percent protection. We include a microfiber pouch to store clean your lenses.