While Fizik Aliante Gamma XM Kium Saddle may not exactly roll smoothly off the tongue (maybe it does in Italian?), slap one on your bike and it will wax eloquent about its optimal blend of comfort and weight for as many miles as you can ride. It's built off the 'Bull' family of Fizik's Spine Concept system, so it's designed around cyclists who are less flexible and therefore need more cushion for soft tissue areas as they roll forward on the saddle. The K:ium rails are constructed of an alloy lighter than titanium, and they're plenty stiff so they won't deform under power.
Microtex cover is durable and weather resistant
Nylon-reinforced carbon fiber shell is flexible enough to move with your body, but stiff and durable as well
Ergonomic dip platform and rolled edges are designed for riders with less flexibility
K:ium rails provide high strength-to-weight ratio and excellent vibration damping