When you have FlipUps REC 58 G by Foster Grant, you don't have to choose between the readers or prescription eyeglasses you love and the sunglasses you need. This accessory simply clips on to the front of your existing glasses and instantly transforms them into sunglasses. Match the lens size of these FlipUps with the lens size of your glasses to find the right fit.Foster Grant Polar Optics FlipUps™ quickly transform your eyeglasses or readers into a pair of polarized sunglasses. They attach at the bridge of your eyeglasses and flip up and down as needed.