The c17 carved is made from the same vulcanized natural rubber and organic cotton canvas as use for the c17 with an added cutout section to the top which alleviates pressure in the perineal region experienced by some long distance cyclists supporting comfort on longer rides 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 rubbe