Flak is finally outdated
The Fast Jacket is the latest in a long line of pieces in the 'Jacket' line (Half Jacket, Straight Jacket, Flak Jacket, etc.), and quite unequivocally, the greatest. Finally, a design that brings everything to the table; Oakley's amazing optics, a lightweight and comfortable frame, excellent facial coverage (lenses are significantly larger than the Flaks), and a truly interchangeable lens system (easier than even the Jawbone, whose Switchlock tends to stiffen over time). Nice being able to change lenses without a flowchart, or fear of breaking the frame, as common with previous Jacket iterations. Granted, because of the alloy elements in the Switchlock functionality, the Fast Jacket is somewhat heavier than a Radar or a Flak Jacket, however, according to Oakley, their weight is actually identical to that of the Jawbone.
Extremely impressed with this piece - another true evolution in sports sunglasses.