• Aluminum-magnesium frame construction generates proper strength    and optical stability through a hybrid lightweight metal alloy; • Hidden spring hinges flex to ergonomcally fit a wide variety of head and    face shapes; • Lightweight construction and proper weight balance guarantee long    wearing comfort without pressure points or fatigue;  • Micro-engineered lenslocks securely retain lenses without undue stress    or distortion of the optics; • Adjustable floating nose pads articulate in 3 dimensions to properly fit    and comfortably secure eyewear in place.