Oakley extended the field of view in the upper peripheral region of the Jawbreaker Sunglasses to optimize it for cycling, and once Oakley added Switchlock Technology for easy lens changing plus temples that adjust to three different lengths for helmet compatibility, Jawbreaker became the ultimate sport design. Switchlock is an easy and hassle-free, simple switch mechanism to release the mounted lens so a new one can be locked in instantly. Impact protection offers uncompromising protection against high-velocity and high-mass impact. High Definition Optics (HDO) meets or exceeds the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance. Unobtanium increases adhesion when wet to grip better when you perspire. Iridium lenses balances light transmission and reduce glare.