The additional flexibility absorbs bumps and vibrations from the road, functioning much in the way of a shock absorbing seat post. Naturally Flexible Brooks Cambium is a range of saddles made from vulcanized natural rubber and organic cotton canvas enhanced by a thin layer of structural textile for added resilience and legendary Brooks longevity. The uniquely flexible, maintenance-free, waterproof top is designed to follow the rider’s movements to deliver immediate comfort and ease of use. Built for life This saddle is assembled from replaceable parts and requires no special tools for servicing. Read more… The vulcanized rubber top is practically indestructible; should your Cambium frame suffer an unfortunate accident, repairs can be quickly and easily accomplished by you or your trusted Brooks Dealer of Excellence. Natural look The Cambium owes its remarkably natural look and feel to a woven organic cotton textile. After the vulcanization process, the cotton is then treated with Brooks Numac to completely protect the saddle against the elements.