The Half Jacket 2. 0 Polarized are the next generation of Oakley's best-selling 'Jacket' line of sport performance sunglasses. The redesigned 2. 0 features a carefully engineered balance that combines the best aspects of the old Half Jacket with the recent Fast Jacket for a subtly edgy, superbly comfortable, and universal fit that wears as great on the bike as it does everywhere else. And fitted with Oakley's superlative polarized lenses, you'll get unmatched optical clarity and glare reduction for the brightest afternoons on the road. What makes Oakley polarizing different is that they figured out how to integrate the filter into their lenses without applying glue. Other optics makers typically sandwich the filter between thin layers of lenses using clear glue. The glue is often the source of the slight distortion you experience when wearing some polarized glasses. Another plus of Oakley polarizing is they make both the right and left lenses at the same time and cut them out in parallel pieces so the filter lines up exactly the same way for both eyes. This is one less piece of optical information for your eyes and brain to adjust to, which adds up to yet another reduction in potential eyestrain. Like every Oakley design that leaves their Foothill Ranch factory, the Half Jacket 2. 0 not only meets, but exceeds the rigorous standards set by the American National Standards Institute (ANSI). Granted, the worst that most of us will ever see is the occasional tree branch, or fast-flying insect, but Oakley still designs their lenses to withstand impacts as great as these, keeping your eyes protected wherever you ride. 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. These optically-correct lenses are constructed from pure Plutonite, Oakley's proprietary polycarbonate that not only blocks all harmful UV-A, UV-B, UV-C, and harmful blue light up to 400nm, but i.