Powermadd ESR Seat Riser Kit - 3in. 52010The ESR (Ergonomic Seat Riser) kit takes you to the next level of comfort and control The rider forward design of the Rev was a great leap forward, but, as we all know, the seat level is just a little low which puts an unnecessary strain on your knees and back The ESR kit combines 3in. or 1. 5in. of additional pre cut foam with a gripper style seat cover, which makes riding the Rev a real dream The additional height eliminates knee and back fatigue