Oakley Latch Key Sunglasses (Violet Iridium Lens) The Oakley Latch Sunglasses are a fresh path from the trailblazers of style with this design inspired by influential athletes. They are shaped with a classic keyhole bridge and the curves of rounded lens orbitals, and are engineered with the convenience of an interior kick-up feature that lets you clip it to your shirt. FEATURES AT A GLANCE Lightweight O Matter™ frame material with Square O metal icon and front rivet accents Clip hinge mechanism that enables the eyewear to latch onto your t-shirt to secure eyewear 6 base lens geometry with HDO® Increase of 17% In Light Transmission Ideal For Use In Bright Light Conditions Neutral Contrast