Perfect for the military, law enforcement or recreational shooting, the Oakley SI Ballistic Shocktube is built with an upper and lower jaw to maximize impact protection. For your convenience, these sunglasses make lens exchange easy with an included Hex-key. Swap lenses with minimal effort so you’re always ready for whatever your next mission holds. Thin ear stems enable the use of communication devices, while an non-slip Unobtanium nosepiece offers a reliable grip even when you’re sweating. Made with only the best materials, Oakley delivers Plutonite lenses housed in a chemical and impact-resistant O-Matter frame. Lightweight and durable, this frame is made with a Three-Point Fit that keeps the lenses in exact optical alignment and eliminates pressure points for comfortable all-day wear. With high definition optics, the lenses deliver both optical clarity and UV protection.