What Our Gearhead(R) Experts Are Saying:"I like this saddle for long endurance days. The semi-round shape makes it easy to shift positions, and the Nack rails keep the weight low while still feeling solid under hard efforts."We turn to the Nago R4 PAS Carbon Saddle when we want a lightweight platform that feels supportive without locking us into one position. The semi-round T-shape gives us room to move along the saddle's length, letting us shift forward for climbs or settle back when the pace smooths out. Even with its narrower 137mm profile, the supportive shaping keeps us grounded and comfortable across long rides on road or mixed surfaces. The open PAS channel helps relieve pressure as the miles stack up, improving circulation and reducing the numbness that can creep in on long days. Prologo's variable-density foams work independently on each side of the saddle, allowing the support zones to respond naturally to different pedaling phases. Paired with the carbon-focused build, it all creates a performance saddle that feels responsive, adaptable, and comfortable deep into the ride.