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PROLOGO ZERO TRI PAS The Zero TRI PAS saddle is designed by Prologo especially for the use in triathlon. The flat shape is suitable for medium-short distances. The big cut-out extends the entire length of the saddle relieving the peak of pressure in the perinereal area and it is much easier to stay in the typical triathlon seating position.The PAS system(perinereal area system) is a processing of the base of the saddle, the hole or channel has been designed in order to eliminate pressure to the pelvic area.The Pas Technology is achieved thanks to a particular anatomical shape design of the foam and base. The performance and durability are ensured thanks to the unchanged integrety of the base.the T2.0 rail. It uses a Chromo-Molibdeno rail with a very high tensile strength.It has 7mm rail clamp diameter.