Brooks C15 Cambium Carved Saddle. The C15 is the first racing model in the Brooks Cambium family, and the Brooks Cambium C15 Carved takes its proven, high performance shape and adds an ergonomic center cut out for optimal pressure relief and comfort. Featuring a narrow profile for pedaling freedom and reduced weight, the firm, yet supple, C15 Carved will reward you with increased performance on your longest of rides. Its cover is made from vulcanized natural rubber and organic cotton which is mated to a die cast aluminum structure and tubular steel rails. A distinct dampening effect is delivered by the classic Brooks hammock construction keeping the rider in unparalleled comfort mile after mile. And there's no mistaking that this is a Brooks saddle as the cover features the venerable company's signature rivets at the fore and aft.