Abstract: The invention relates to a self-inflating brassiere padding for insertion in a pocket of a cup or into a cup of a brassiere to grant the user the desired appearance of enlarged breasts in a wide range of volume and shape, comprising; (a) a deflatable, preferably monoblock part made of spongy material for giving the breast any desired form, size and support; (b) an air-hermetic coating for the monoblock part making the padding airtight, which allows wide-range regulation of self-inflation volume of the padding, the coating being an integral part of the monoblock part and resulting from the property of self-skinning or a separate coating of the padding; (c) a venting opening/hole made in the coating to let atmospheric air into the padding, the opening/hole either being closed by an hermetic or air-hermetic cork or any other hermetic or air-hermetic closure means for stopping the self-inflation at any stage, or including a hermetic or air-hermetic valve, the valve providing a possibility of regulation of self-in