Fi'zi:k Arione VS Carbon Braided Bike K:ium is the combination of a particular metal alloy, a specific tubular design and a special finishing process which increases fatigue performance on the rail surface. VS specific Comfort Channel along the length of the saddle. Wing Flex Technology- Engineered flexibility along the edges where the inner thighs contact the saddle. Carbon reinforced nylon shell for excellent strength and durability Microtex central cover is durable, water-resistant and enhances grip, even when wet