Within Fizik's Spine Concept Fit System, the Arione R5 Saddle features a snake profile designed for the most flexible riders. The Arione R5's shell uses a Nylon Carbon Thermoplastic Composite and is light, stiff, and a full 300mm long. Fizik's Wingflex technology ensures that you're comfortable and that you're directing all of your power into the pedals, rather than the saddle. Wingflex accomplishes this by designing the top of the saddle to be stiff and supportive while the outside is allowed to flex while you pedal. The R5's 132mm width provides ample support for your sit bones, and the saddle is covered with a durable Microtex fabric that is gentle on your cycling shorts and durable against abrasion. The R5 saddle sits atop Fizik's Kium rails, which are about 8% lighter than titanium rails and feature a silicone and chrome construction for maximum vibration absorption.