The Oakley Valve Sunglasses - Black Iridium Lens is a great all-rounder with all the features you'll need for comfortable and effective sport performance while also looking the part with casual wear. O Matter frame material is one of the secrets behind the durability and comfort of this frame. It's a stress-resistant, lightweight synthetic that maintains a critical degree of flexibility to offer a feel-good fit with impact resistance. By making contact only at the bridge of the nose and sides of the head, the Three-Point Fit further improves comfort while holding the lenses in precise alignment so they can give you performance that meets all ANSI Z87.1 optical standards. The 8.75 base lens curvature extends your peripheral view while improving side protection against sun, wind and impact. Head-on protection meets ANSI Z80.3 basic impact standards, and the Plutonite lens material filters out 100% of all UV.