Though unconventional, Oakley's Clifden sunglasses were engineered for one purpose: mountaineering. Built to protect you again the elements, these frames were designed with side shields and a bridge blocker. On top of that, there is also an integrated leash so you don't have to worry about losing them and can focus on the conditions around you. All of these facets come together with Oakley's PRIZM lenses to create a truly mountain-worthy pair of sunglasses you won't want to go on an adventure without. Features of Oakley Clifden Sunglasses Lightweight and Durable O Matter™ Frame No-Slip Unobtainium™ Nosepads Available with PRIZM™ Lenses Designed to Enhance Color, Contrast and Detail Polarized and Iridium™ Lens Options Available Three-Point Fit Designed for Comfort and to Keep Your Eyewear in Place Interchangeable and Removable Bridge Blocker Keep Faces Protected Unobtainium Side Shields Block Glare Integraded 20" Coated Woven Steel Leash Oakley Clifden Matte Black w/PRIZM Snow Black Iridium Lenses OO9440-0156