SITERO PRO SADDLE Specialized's Body Fit Geometry specialists, engineers, and even doctors all agree, the Sitero Pro Saddle offers a best-in-class fit for aerodynamic time trial positions. Starting with the rails, this saddle uses FACT carbon fiber to deliver exceptional strength at a low weight for heightened bike feel, which is bolstered by the Level 2 medium-density foam padding that helps soak up road chatter. The wide channel and aggressive shape balance comfort and support, and SWAT-compatible mounts molded into the saddle base give you the option for sleek, streamlined storage solutions.