Prologo Nago R4 PAS Nack Saddle

The Prologo Nago R4 PAS Nack Saddle is a race-ready perch built for riders who spend long hours in the saddle and want every gram to count. It's the open-channel version of the Nago R4, the modern evolution of Prologo's original NAGO — a saddle that debuted in 2008 and has since backed a Giro d'Italia win and numerous Classics victories. The T-shaped, semi-round shell widens toward the rear, giving you room to shift position over a long ride, while the reduced 137mm width suits riders with a narrower sit-bone stance (a 147mm option is available for those who need more support).

Down the center runs Prologo's PAS — Perineal Area System — a channel developed through the brand's Pressure Map MyOwn testing to relieve pressure peaks and numbness on long efforts. Two independently sculpted foam sections sit on either side of that channel, each using variable-density foam so the saddle stays supportive without feeling stiff underneath you. The shell rides on a long-fiber carbon base paired with Prologo's Nack rail — a carbon fiber, kevlar, and aluminum filament construction that keeps total saddle weight to roughly 141 grams while adding stiffness for efficient power transfer, a step up from the brand's alloy Tirox rail option. For road riders logging serious mileage who want a saddle built around comfort as much as performance, the Nago R4 PAS Nack is a solid pick.