Flexy

Up front, a new softer "floating" cuff and a tapered rib— both for easier flex. At the rear, a new lightweight and responsive back. ... that cradles the calf In short, everything Hank hankered for. The Avanti's shell has our softest, flexiest plastic yet.

If the pedal can't flex, the shoe can't—no matter how flexy it may be just out of the box. Besides, the part of your foot that's behind the pedal can't flex while you're pedaling, because your foot mechanics won't allow it.