Latch® Alpha presents a bold lens shape and double bridge architecture crafted by blending die-cast aluminum with high density Unobtainium® in a frame that clips to your shirt, raising the bar on style. Features Die-cast aluminum center – lightweight and durable High density Unobtainium® temples for Increase grip with perspiration Silicone nosepads for comfort and adjustability Frame suitable for medium to large faces Prizm™ lenses enhance color, contrast and detail for an optimized experience HDPolarized: Minimizes glare via technology that produces a comprehensive, single-layered lens (optional) Plutonite® lens material offers top UV Protection filtering 100% of all UVA, UVB up to 400nm and some of harmful blue light Glare reduction and tuned light transmission of Iridium® lens coating Optimal precision and impact resistance that meet or exceed ANSI Z80.3 optical and impact standards HDO® Optics for crystal clear vision and impact resistance Available with Oakley® Authentic prescription lenses High Definition Optics® High Definition Optics® (HDO®) is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance. PRIZM™ Prizm™ is a revolution in lens optics built on decades of color science research. Prizm™ lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility. Polarized® Improving safety, comfort and performance, Oakley HDPolarized lenses filter out 99% of reflected glare without the haze and optical distortion that can come with polarized lenses made with conventional manufacturing techniques.