3t ionic 25 team stealth comfort seatpostionic 25 comfort enhances the standard ionic 25 post with shock absorbing technology a polymer damping ring between the head and the difflock clamp decouples the head from the shaft of the post preventing high frequency vibration from being transmitted to the rider ionic 25 comfort helps reduce rider fatigue on todays generation of ultra stiff aero race bike chassis and bikes intended for endurance riding team stealth version has a carbon fibre sha