Cloudswal Unisex 3 Pieces Day+Night Outdoor sport cycling Polarized Clip-on Flip-up Sunglasses Clips on ANY pair of glasses into sunglasses Transforms regular glasses into sunglasses Attaches onto existing prescription or fashion glasses, Great for those who already have a pair of prescription glasses and do not want to spend more for a pair of prescription sunglasses. Easy to clip on to any regular glasses (not suitable for glasses which bridge is very thickness.) Lightweight and scratch resistant.