The two position XCP height adjustable seatpost allows XC racers to maintain a more confident body position & maximize performance while climbing & descending. Two positions Power & Cruiser. 35mm of travel is ideal for maintaining momentum. Compatible with both carbon & alloy saddle rails.FACT carbon lower tube construction. One piece forged inner tube assembly for optimal weight & strength. Internal routing design.27.2mm seat post diameter. Weights with alloy saddle clamps:350mm: 395g 400mm: 415g