O-Luminum is 40% lighter than pure titanium, giving Hatchet™ a finished weight of just over one ounce. Machined with tolerances of one thousandth of an inch, the digitally rendered contours blend linear earstems with sculpturally integrated hinges, custom engineered with spring mechanisms for a comfortable fit. Patented XYZ Optics® maximizes clarity at all angles of view, and Unobtainium® components increase grip with perspiration. All Oakley eyewear is warranted for one year from the date of purchase against manufacturer defects.