The arione is 1 of fiziks 3 spine concept mens road saddle shapes of these 3 the arione shape is flat narrow and long the r3s carbon braided rail reduces weight and increases saddle stiffness fiberglass thermoplastic composite shell with wing flex for freedom of thigh movementbraided carbon rails arione r3 is for the snake flexible spine if you are very spinally flexible far less than 90 degrees between your straight legs and your back when bending over as far as you can keeping