A kind of
pedal for
road bikes that require special
shoes, and named after the
company that came up with them. They probably have a
patent. The shoes have a very stiff
sole and a
funny looking plastic
cleat on the bottom that make them almost impossible to
walk in.
Before using them it is imperative that you learn to fall down without hurting yourself, or you really will when you fall down attached to the bicycle. And you will. Trust me.