Ride farther with the eeSilk suspension seatpost. The eeSilk seatposts are comparable in weight to traditional rigid seatposts while offering 20mm of vertical compliance improving control on rough surfaces and reducing fatigue on long rides. Lightweight design compares with traditional rigid seatposts 20mm of vertical compliance Smooths rough roads and reduces fatigue on long rides Di2 battery compatible #5 elastomer is factory installed, other weight elastomers sold separately.