Back in April of 2012, as Tom Boonen's incredible solo breakaway closed in on a fourth victory at the Roubaix velodrome, his smiling face was on every camera, and on that face, the then unreleased Radarlock Path Polarized Sunglasses. The Radarlock is perfect for hellishly long days in the saddle like Paris Roubaix, where rapidly deteriorating weather necessitates the adaptability found in quick lens changes. This subtly redesigned Radar combines the lightweight O Matter frame and superlative fit and lens coverage of the original, while adding in Oakley's Switchlock technology to ease the difficulty of changing out lenses. As evidenced by its name, the Radarlock is characterized by Oakley's Switchlock technology, which allows you to change out the lens quickly and efficiently. Due to the Radar's unique Polaric Ellipsoid shield lens geometry, the mechanism is a little different than what you'd find on the Jawbone or Fast Jacket, but very simple nonetheless. Simply engage the slider switch on the inside of the left temple, and pivot the earstem towards the inside of the lens to open the clamp. This relieves all of the mechanism's clamping pressure, which enables you to slide the lens out of the frame groove and the notches on the opposing temple. If it seems like all of the switching and hinging is over engineered to simply change out a shield lens, you'd be correct. But remember that every Oakley design that leaves their Foothill Ranch factory must not only meet, but exceed the rigorous standards set by the American National Standards Institute ANSI. So not only must Switchlock ensure easy lens swapping, it must also ensure the lens remains snugly in place to protect your eyes at high impacts like these. What good would safety standards be without near perfect clarity' Oakley's patented High Definition Optics HDO boasts some of the best clarity in the industry. Part of the beauty of Switchlock is that the mechanism evenly distributes the clamping force over th...