Part of the Standard Issue series, Oakley SI Ballistic Det Cord OO9253 Sunglasses kick things up a notch. Each style of these Oakley sunglasses is fully compliant with the ballistic and optical standards of MIL PRF32432 and ANSI Z87.1 (2010), making these Oakley sunglasses great for military operations, aggressive environments and covert capabilities. Lightweight O-Matter frames offer premium comfort, while peripheral vision is maximized by XYZ Optics, an innovation that maintains visual clarity at all angles of view. Oakleys Three-Point Fit keeps the lenses in precise optical alignment. The SI Ballistic Det Cord is also fully equipped with an anti-fog coating, comms-compatible ear stems and nonslip Unobtanium nose pads, creating one piece of eyewear that is ready for any situation. Select styles are part of the Daniel Defense collection (Daniel Defense is a top manufacturer in commercial rifles and state-of-the-art barrels) and feature exclusive DD Cerakote coatings for even greater durability. Nonpolarized. Made in USA. About Oakley lenses: Prizm: Designed to deliver ultra-precise color tuning for any environment. By fine-tuning individual wavelengths of color to make everything vivid and vibrant, Prizm sharpens visual acuity to reveal nuances that would otherwise be missed by the naked eye. Iridium: This special metal oxide coating allows Oakley to fine-tune lenses of any color. The iridium coating regulates contrast, glare, reflection, light transmission and light absorption, tailoring the lenses to better fit specific conditions. Gradient: Offers a smooth transition in shading from a darker top to a lighter bottom while still retaining true color perception. Photochromic: A premium option for select single-lens eyewear designs, it darkens the lens automatically to help you adapt to changing light and always perfor Type: Non-Polarized.