The easton haven seatpost uses exclusive taperwall technology to shave weight to a minimum without harming overall strength and durability creating the perfect all mountain post which is compatible with 7 or 8mm rails eastons taperwall technology infuses tubing with unique performance characteristics revered by cycling enthusiasts and world class athletes the computer modulated draw benches allow easton to create multiple tapers in the same tube so the tube walls can be reinforced anywhere al