A breast implant device product that mimic the natural pectoral fat pad of the breast and is characterized by an incomplete pyramid with isosceles triangular base and wedge-shaped edges and sloping faces that meet at acute angles with variable degree located medially, laterally and on the top and a footprint characterized by a semicircular lower portion and an oval paraboloid upper portion and a center of gravity located closer to the base than to the profile, the said footprint is advantageously converging and moving towards the underlying surface as the chest wall with a method of manufacturing and a method of use of the said implant including a breast pyramid sizing system.