The Alpha lens was designed to maximize field of view and protection, without sacrifice to style and aesthetic. All replacement lenses meet MIL PRF 32432 Ballistic Impact Standard, and Optical Clarity of ANSI Z87.1. Fits SI Ballistic M Frame Alpha. Does NOT fit any other M Frame models. Features: • Fits SI M Frame Alpha and SI Halo High Definition Optics (HDO) for unbeatable clarity and performance • Lens contours that extend peripheral vision and improve side protection • Plutonite lens material filters out 100% of all UVA/UVB/UVC & harmful blue light up to 400nm • Unsurpassed impact protection • Options include Iridium lens coatings and polarization • Compatible with SI Helo Kit Compliance: Fully compliant with the ballistic and optical standards of MIL-PRF-31013 and ANSI Z87.1-2015 Oakley Eyewear Care - Oakley Lens Cleaning Information All Oakley Lenses: To help maintain the High Definition Optics (HDO) of Oakley lenses, your new eyewear comes with a specially-woven electrostatic Microclear bag for cleaning and storage. Using it will preserve the superior optical quality of Oakley’s pure Plutonite lenses. Hand wash and air-dry the Microclear bag regularly. Iridium Lenses: Oakley Iridium lens coating is engineered to reduce glare and improve contrast. An array of available tints allows the wearer to balance light transmission in any light condition. The 12-micron jacket of Iridium must be treated with special care to avoid scratching. It is only recommended to use an Oakley Micro Bag or Oakley Lens Cleaning Kit to clean Oakley lens, do not use any other solvents, chemicals or third party cleaning kits because they have not been tested on our lenses and can possibly damage them. Replaceable Frame Accessories: Frame accessory kits are available for some Oakley eyewear styles. Do not attempt to remove or replace any other eyewear's parts as this will void its warranty. Oakley Standard Issue items are available for US sales only . We will ship only to United States destinations and US military bases. Oakley Standard Issue items on orders shipping outside the US will be removed before the order is processed.