Prologo dimension tri nack saddlethis top quality saddle is specifically engineered for road use as it offers awesome comfort and control on every ride. It features a robust microfibre cover which makes it perfect at withstanding multiple changes to your riding position and the intensity from day long journeys. Prologo has also upped their game by equipping it with light foam padding with variable densities, so you'll benefit from increased stability and comfort as you explore every road with confidence.nack carbon rail road saddledesigned to deliver race winning performance, this brilliant version is equipped with a nack carbon rail construction. This makes it incredibly stiff when climbing as well as lightweight, so you won't have to worry about any unnecessary grams holding you back from a podium topping finish.features cover material microfibre rail material nack carbon padding light foam use road, triathlon, tt gender unisex dimensions 245x143mm rail dimensions 7x9.3mm weight 181g approxbuy prologo components from chain reaction cycles, the world's largest online bike store.