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Serfas DDMD-200 Tailbone V Mens Saddle collection_pumps Shimano hydraulic disc brakes forAbout Serfas DDMD 200 Tailbone V Men's Saddle The Serfas Dual Density line of saddles is constructed using their patented I. C. S. (Infinite Comfort System) technology. Made up of a soft flexible rubber base followed by two layers of soft and firm closed cell foam, and a final top layer of friction reducing Reactive Gel. Features Dual Density Progressive Foam Technology, steel rails, and durable waterproof Soflex cover. Features Dual Density Base Deep