OakleyA(R) Sylas is a classic frame with reliable features. Feel secure in this new style that goes above and beyond the standard with upgraded features for all-day wear, including a hat compatible design, lightweight frame and Prizm(TM) Lens Technology. a HAT COMPATIBLE: hat compatible frame and temple design with an increased extended periphery a SEE MORE DETAILS: Available with Prizm(TM) lenses that are designed to enhance color, contrast and detail to make the most of any activity a FIT: Three-point Fit is designed for comfort and to hold your eyewear in precise optical alignment a LIGHTWEIGHT: Lightweight O Matter(TM) frame material provides durability and all-day comfort a PRESCRIPTION: Available with Oakley Authentic Prescription lenses for athletes of all levels with RX needs