The Diminseion project started with a clear target: the creation of an innovate product suitable for all categories of cycslists. This is why the dimension line is extended and dimentiosn NDR is born.  (Born to be MTB oriented) has 3 mm extra padding than the dimension 143 in order to reduce vibrations cpme off the ground. On the sides Prologo adds side protectot! to avoid scratches or damages. The PAS System is a channel in the base of the saddle.The fole or channel helps to maximise blood flow and support the pelvic area while also preventing pressure peaks, This system is desogned and developed to eliminate numbness and pressure to ares that need it most.  Prologo Dimension NDR T4.0 Saddle Features  Size: 245 c143mm Rail:T4.0 7mm Cover:Microfibre Padding: Light Foam Weight.218g