PRIZM is a revolutionary lens technology that fine-tunes vision for specific sports and environments - see what you've been missing!_XYZ Optics for razor sharp clarityXL edition: enhanced lens coverage and specialised lens curvature for protection against sun, wind and impactUnobtanium earsocks and nosepads keep glasses in place, increasing grip despite perspirationPatented High Definition Optics (HDO) provides superior optical clarity and razor-sharp vision at every angleO-Matter stress-resistant frame material is both lightweight and durable for all-day comfort and protection