Designed with our Retül fit specialists, doctors, and engineers, the Sitero is the best-fitting saddle for aerodynamic time trial positions. A wide channel, progressive shape, level 2 padding and multiple width options provide optimal comfort and support for long distance rides in an aerodynamic position. And to further ensure that this is the best Triathlon/Time Trial saddle on the market, it features hollow Chromoly rails and SWAT™ mounts that allow for aerodynamic storage of your ride essentials.Next-level comfort for riders of all sizes while in the aero position.,Lightweight and supportive PU padding for comfort and support on longer rides.,4-way stretch cover material for unparalleled Pelvic rami comfort.,Level 2 padding: Medium density foam for bike feel with additional cushioning.,Durable hollow Cr-Mo rails.,Integrated Direct Mount Reserve Rack included for bottle/equipment storage solutions.,SWAT™-compatible mounts molded into the saddle base allow for sleek and integrated storage solutions..