Oakley Sylas OO9448-2657 Matte Brown Tortoise / Prizm Tungsten Polarised Oakley 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 Lens Technology. Hat compatible frame and temple design with an increased extended periphery Available with Prizm lenses that are designed to enhance colour, contrast and detail to make the most of any activity Three-point Fit is designed for comfort and to hold your eyewear in precise optical alignment Lightweight O Matter frame material provides durability and all-day comfort Available with Oakley Authentic Prescription lenses for athletes of all levels with RX needs Filter Category 3: General purpose sunglasses. High protection against sunglare. Good UV protection. Not suitable for driving in twilight or at night. Sunglasses and Fashion Spectacles are: - Not for direct observation of the sun. Not for protection against artificial light sources, e.g. solaria. Not for use as eye protection against mechanical impact hazards.