Two and Three Lens System combines ballistic protection, and optical perfection, with the most versatile, adjustable frame design on the market. Patented, rubberized nose bridge adjusts to any nose bridge size and shape. Dock and lock the T-PegTM Elastic strap to the temples of the PT-3 and do any operation imaginable without having to worry about losing your eye pro in the process. Wrap back design provides incredible side protection. Meets ANSI Z87.1-2003 High Velocity Safety and the military's Vo Ballistic Standard - MIL-PRF-31013.