Ritchey came out with the Evolution line of bars as a way to bridge the gap between standard round drop bars and ergonomic winged bars. In a sense, they are the "evolution" of the standard round bar. In this case, it is at Ritchey's SuperLogic level - the absolute lightest and strongest level of a component they offer.
The SuperLogic Evolution bar feature a flattened top profile with a 3° back sweep. The tops are not quite winged, but ovalized and flattened. This ends up being really comfortable on your hands without being excessive like some winged designs we've seen on the market. The bar is designed with smooth transition lines to the levers and a moderate drop for quick access down low. The extended 31.8 center section by the stem clamp area is compatible with clip-on aero bars.
What makes these bars so light and strong is the construction. They have a butted and internally relieved UD (unidirectional) carbon monocoque construction. Grooves underneath the bar hide shift and brake cables. Sandpaper-like texture by stem and brake/shifter clamp areas prevent slippage and allow the stem and controls to be mounted with less torque. The SuperLogic Evolutions are available in 40cm-44cm and come in the industry standard 31.8mm bar clamp diameter.