Taking its K series name from the starting point of Hawaii's world famous triathlon, the Fi'zi:k Arione Tri 2 K3 with Kium Rails features a tri optimized shape and lightweight, race worthy design. Extra nose padding enhances comfort in the aero position, while the cover's silicone printed grip prevents excess sliding in the saddle. For the construction of this saddle, Fi'zi:k employed their composite glass co injected nylon shell for stiffness and support, with Wing Flex technology for a bit of extra flex along the sides to accommodate pedaling movement. Kium alloy rails are lighter than solid titanium, yet incredibly strong for an ideal combination of lightweight performance and durability. Additionally, this saddle features Fi'zi:k's Integrated Clip System ICS for quickly attaching Fi'zi:k saddle packs and blinking rear lights.