The Selle SMP F20 Carbon Rail Saddle is a lightweight saddle with maximum versatility that can perform on any machine from a road bike to a mountain bike. It is made to comfortably accommodate riders with medium or narrow sit bones. The shape of the saddle allows riders to move around the cockpit to remain in their best riding position. This version of the F20 features unidirectional carbon rails which are incredibly lightweight and stiff for the highest level of performance. This saddle is lightly padded with a foam elastomer compound and features a centered cutout for relief of pressure to sensitive areas. The rear of the saddle also has a cutout for target pressure relief. The Selle SMP F20 Carbon Rail Saddle is a great choice for a rider who wants comfort and versatility.