Rarely used 2013.  The factory description says it all......

Race the local crit on Saturday and ride a century on Sunday with Look's do-everything 566. Sure, it's got the awesome lightness, efficiency and speed that Look is famous for, but the 566 sports a shortened top tube and taller head tube for a more upright, comfortable position that allows ride-all-day bliss. Plus, it's crafted from a blend of high-modulus, high-resistance carbon with a massive bottom bracket and a squared down tube for stomp-on-the-pedal jumps out of the pack and flattening climbs. The 566 is led by a wonderful vibration-damping carbon fork, too.