Includes one set of frames and two sets of "swappable" lenses (grey and clear.) SI Ballistic HNBL is an eyewear platform for everyone. The low-profile design and easy lens exchange allows you to seamlessly transition from on-duty to off-duty. HNBL is optimized for performance meeting high impact standards for Mil Spec 32432A and ANSI Z87.1 as well as featuring Prizm™ Lens Technology. The frame features a lightweight, high-wrap design with thin stem technology and molded icons. The frame design is also suited for industrial prescription lenses. All sun lenses feature Oakley High Definition Optics (HDO®) and meet high mass and high velocity impact requirements.  Durability and all-day comfort of lightweight, stress-resistant O Matter™ frame material Comfort and performance of Three-Point Fit that holds lenses in precise optical alignment System features quick, tool-free lens changing Thin stem technology enables compatibility with over-ear hearing protection and communication systems Secure fit, even in wet conditions via hydrophilic Unobtainium nose pad Ultra-lightweight design (1.07-ounce total weight) Full compatibility with MICH, ACH, CVC, PASGT, Ops-Core, Team Wendy and Crye™ Helmets Impact and chemical resistant O Matter frame material Frame suitable for all face sizes Frame design is suited for Industrial RX lenses All optional lenses are made of Plutonite, Oakley’s high purity optical-grade polycarbonate All lenses feature Oakley High Definition Optics (HDO ) with Polaric Ellipsoid™ geometry UV protection of Plutonite lens material that filters out all UVA / UVB & harmful blue light up to 400nm wavelength Meets or exceeds high mass and high velocity impact requirements per ANSI Z87.1-2003/2010 Meets or exceeds ballistic fragmentation impact standards per MIL PRF-32432A Clear lens features 89% visible light transmittance, suitable for use in low-light to no-light conditions Grey lens features 15% visible light transmittance, suitable for bright light; meets MCEPS neutrality and chromaticity requirements All lenses feature backside anti-fog coating Oakley SI Ballistic HNBL Safety Glasses With Grey & Clear Lenses OO9452-0465