Condensed cranial geometry allows smaller faces to take advantage of an X Metal® first: the fitted comfort of a spring-hinge mechanism. Changeable Unobtainium® nosebombs and earsocks increase grip with perspiration as spring-hinges control the articulation of this lightweight, 3-D sculpted alloy. Oakley's XYZ Optics® extends clarity to the full periphery of the wrapped, raked-back lens contour. Each masterwork is laser engraved with a unique serial number. All Oakley eyewear is warranted for one year from the date of purchase against manufacturer defects.