The SI Quarter Jackets combines modern, athletic styling with high-tech materials. An interchangeable lens design allows you to adapt to changing conditions. O Matter® frame is lightweight but maintains a critical degree of flexibility to offer a feel-good fit with impact resistance. Three-Point Fit and Unobtainium® components hold the Quarter Jacket firmly and comfortably in place. PLUTONITE® lenses meets all ANSI Z87.1 standards and feature 8.75 base lens curvature for improved peripheral vision and protection.