The new Retro Clip On sunglasses give you completely clear vision... with UV and blue light protection for the ultimate in style and light spectrum filtration.World Famous BLUBLOCKER? sunglasses are made of tough , clear Malenium, a lens that provides exceptional vision and clarity! BluBlockers also use a special form of nylon material with inch memory retention inch which makes the frame flex back into its original position after deflection.BluBlockers? adjust to weather conditions and their special light-weight nylon frame construction makes them suitable for all size faces. Without a doubt, they are the finest pair of sunglasses you can buy for lens quality, frame construction and comfort. Backed with a Manufacturer's Lifetime Replacement Program!