oakley men's standard issue ballistic shocktube sunglasses,os,terrain tan/grey oakley forged with protection, shaped with industrial style, and built for speed, si shocktube brings ballistic capability to new levels. fully compliant with the ballistic and optical standards of mil prf 32432, si shocktube is composed of an upper and lower jaw to maximize impact protection. simple lens exchange with an included hex-key, the product allows the user to swap lenses seamlessly. an unobtanium nosepiece and thin ear stems makes si shocktube adaptable for the active needs of military, law enforcement, or recreational shooting.<br><br>plutonite lenses offer top uv protection filtering 100% of all uva, uvb, uvc and harmful blue light up to 400nm <br>patented high definition optics (hdo) provides superior optical clarity and razor-sharp vision at every angle <br>three-point fit holds lenses in precise optical alignment while eliminating pressure points common with frames that hook the ears <br>o-matter stress-resistant frame material is both lightweight and durable for all-day comfort and protection