Polarized Polycarbonate Clip on Flip up Canary Enhancing Driving Glasses, 58mm Wide X 47mm High (131mm Wide) (Brown) New lower profile squeez to open clip New leg profile to fit both metal and plastic frames Legs have proprietary coating to protect ophthalmic lenses and prevent shifting and scratching Convenient one hand application to RX frames with positive indexing lens positions Polarized; 100% UVA and UVB protection