The Zipp Service Course SL Seatpost is a carbon fiber component with a strong construction and extra shock absorption. It is specifically tuned to be more shock absorbent than seatposts in the comfort category, strong enough to compare to mountain bike seatposts, and lightweight enough to perform at a high level on the road. A secure two-bolt clamp makes it easy to make micro-adjustments to the position of your saddle. Finding your perfect fit leads to perfect performance. This version is 20mm setback for riders who prefer a specific riding position. The Zipp Service Course SL Seatpost is an extremely versatile component that combines lightweight performance with excellent durability and flexibility.