Prologo Zero-II Saddle with T2.0 Rails: Prologo Zero-II Saddle with T2.0 Rails. A flat saddle for short to medium distance riding where a frequent change in position is necessary. With T2.0 rails & carbon fibre injection base. Active Density Multiple padding zones along the saddle. High density at the rear, medium in the middle & low at the front, this gives the maximum level of comfort where its needed & eliminates pressure during pedal strokes. T2.0 Rail The T2.0 rails are light high strength Chromo rails. Carbon fibre injection base T2.0 rails Light PU padding Road use Flat profile suitable for short rides with frequent changes in position.