The RockShox Isolator upgrade kit builds around a shim-based, spring-backed Internal Floating Piston, giving the fork consistent, predictable damping whether it's the first hit of the ride or the fiftieth. That consistency carries across all three compression settings: Open stays plush through big impacts, Pedal firms up without harshness on repeated hits, and Firm applies maximum damping force to calm bob on efficient climbs, all without going to a full lockout. The kit installs new compression and rebound dampers on the fork's right side, replacing the internals that shipped stock.