Designed with our Retl 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.