Fi'zi:k Aliante R5 K:ium Saddle. The Fi'zi:k Aliante saddle is a favorite among the professional peloton and the Aliante R5 K:ium edition ensures a balance between comfort and weight. The Aliante is built off the 'Bull' family of the Fi'zi:k 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. This saddle features Twin Flex construction that combines two layers within the shell: one layer optimized for stiffness with the other designed to allow flex for comfort. Additionally, the K:ium alloy rails are lighter than titanium, yet plenty stiff so they won't deform under power.