The Brooks Cambium is a staple saddle choice for riders of all kinds. Crafted from naturally harvested rubber and vulcanized for strength and control, its waterproof surface delivers lasting durability and natural comfort across a wide range of conditions. Designed to absorb shock and flex with the rider, the Cambium moves intuitively with the body as the terrain shifts. A consistent performer through constant use and changing environments, it keeps you comfortable and confident wherever adventure calls. C15: Slender width. Perfect for fast gravel, road or touring C17: Medium width. Comfortable saddle for commuting, gravel riding and touring C19: Widest width. Designed for the more upright riding position.