Brooks England Cambium C15 Saddle HANDMADE IN ITALY - Manufactured using 100% Organic (vegan) cotton canvas. RACING MODEL- The structure of the C15 Saddle is comprised of die cast aluminum and the rails are tubular stainless steel for strength and weight-saving. VULCANIZED RUBBER- The Cambium C15 Saddle features natural vulcanized rubber in its construction. WATERPROOF- The C15 is entirely waterproof using Brooks Numac system. INCREASED FLEXIBILITY- the C15s construction is naturally flexible for better comfort and durability.