What is “air-over-air design” in the Reverb AXS seatpost?

Reverb AXS now features an “air only” design, making it more robust and durable. At top out, the air-over-air design puts the rider atop a specially designed air spring chamber with virtually no negative air spring. This delivers a firm and supportive platform for the rider. Once the valve is activated and the post moves into its travel, ActiveRide is engaged. ActiveRide introduces a negative air chamber that balances pressure with the positive chamber, enabling enhanced comfort and control during technical climbs.