With the up and down powers of a yo-yo and the vibration damping abilities of a flat soccer ball, the PNW Components Coast Internal Routing Suspension Dropper Post turns a rough ride into something akin to lounging on a bean bag chair. It's a road- and gravel dropper post combined with a shock-absorber for your rear end. This is the kind of product that goes from "why would I need that" to "can't live without it" after one use.