Prologo zero ii pas tirox road saddlethe prologo zero ii pas tirox road saddle has become one of prologos most popular saddles thanks to its flat shape and relief channel for increased blood flow the prologo tr line of saddles are designed specifically for the pros they have stiffer bases denser padding premium covers and large logos that can be seen from tv cameras shape flatend use roadlearn more with the prologo buying guide featuresthe tr version uses prologos solid titanium rails