"Pas" style description denotes saddle has a central channel cut out for additional pressure relief and rider comfort/preference
Prologo "Flat" saddle shape family class. Ideal for short and medium distance riding and frequent changing/shifting of the riding position. A wider seating surface relative to the Round and Semi-round Prologo saddle shape offerings
General Prologo sizing: 134mm width size is available in Prologo's Round, Semi-Round, and Flat saddle shape offerings. 90% of riders find 134mm fits most comfortably. 141, 143, and 147mm widths are also offered in select Prologo saddle shape offerings.b