Youll look, feel, and perform your best with the Oakley Flak 2.0 XL PRIZM Polarized Matte Black sunglasses are at the top of the performance eyewear game. These standard size frames provide enhanced lens coverage and every inch of the lens is optimized with innovative PRIZM™ technology. This technology includes sport-specific lenses that fit the wearer and their activity. A lightweight design will encourage you to push your limits and compete harder, faster, and longer. PRIZM is a revolutionary lens technology that fine-tunes vision for specific sports and environments. XL edition provides enhanced lens coverage while specialized lens curvature protects against sun, wind, and impacts. Unobtanium® earsocks and nosepads keep glasses in place even for heavy sweaters. Interchangeable lens system lets you swap lenses in and out so you can optimize your vision and adapt to any environment. High Definition Optics ® (HDO®) offer superior optical quality and sharp vision at any angle. O-Matter™ stress-resistant frames are lightweight and durable for comfortable all-day wear and protection. Purchase Includes: 1 Flak 2.0 XL frame, 1 poly microbag, 1 Sport Soft Vault Case, 1 pair of nosepads. High Definition Optics® (HDO®): High Definition Optics® (HDO®) is a collection of patented technologies that allow Oakley eye wear t o meet or exceed the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance.