They Cayo's triacetate lenses are polarized, optically clear, resist fogging, shrinking and scratching and block 100% of harmful UV rays. The polycarbonate frames offer non-slip nose and temple pads for added comfort and performance on or off the water. Polarized Lenses Eliminate Glare and reduce eye fatigue. Polarized Triacetate Lenses are Impact and Scratch Resistant, Lightweight and Durable. AcuTint Lens Coloring system adds color contrast without distorting natural colors, allowing you to see more clearly. 100% Protection from Harmful UVA and UVB Rays.