M-Egal Classic Eyewear Polarized Clip On Flip Up Driving Sunglasses Eyes Wear 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 rimless glasses). Transforms regular glasses into sunglasses. Lens material: polycarbonate. UV400 Lens technology, absorbing 100% of harmful UVA and UVB rays.