Mamivac Conical Nipple Shield is a silicone nipple that is placed over the maternal nipple to make it easier for the infant to latch. For mothers with true inverted nipples or infants with oral abnormalities, this is a good way to facilitate breastfeeding until time is given to correct the essential problem. Mamivac Nipple Shields come in multiple sizes and shapes, Small Cherry, Medium Cherry, Small Conical, Medium Conical, Large Conical.