Prologo cpc nago evo pas tirox saddlethis semi round saddle is ideal for medium distance riding, it offers a good choice of riding positions making it a versatile option for many road cycling situations. The construction of this saddle makes it very comfortable it would be suited equally to training as well as racing.shape semi round end use road learn more, with the prologo buying guide.technologypas system perineal area system this system is designed to eliminate pressure spikes and numbness in the pelvic area. The pas system is achieved thanks to an advanced memory foam style padding which shapes to the rider's sit bone shape. This ensures that pelvis movement during very long distance cycles is not strenuous. The final result is comfort and performance with no feeling of fatigue or numbness.esd ergo shape design esd the ergonomic design gives the saddle a very slender front section, which quickly opens out to the full width of the saddle. Esd permits a round stroke, allowing the rider to maintain a natural position when relaxing or in the attack position. The forward saddle profile gives the thighs more room during all phases of the pedal stroke, whereas the rear part of the saddle helps the rider to find the correct support for the ischial bones. It also helps to avoid riders' tendency to slide forward and instead favours the natural rotation of the pelvis.featuresshell carbon injection monocoquerail tiroxcover microfiber cpcpadding light foamlength 278mm or 280mmwidth 134mm or 141mmweight 228g or 230gbuy prologo components from chain reaction cycles, the world's largest online bike store.