Abstract: A breast protector and assembly are provided. The breast protector comprises a retention cup constructed of a rigid or semi-rigid material and formed into a demi-teardrop shape which approximates the natural shape of an unsupported female breast. The retention cup can have padding permanently or removably attached to an inner surface of the retention cup. A breast protector assembly comprises two retention cups fitted into a retention cup sleeve composed of a semi-elastic material in the shape of a tube. The retention cup assembly is sized so that the retention cups fit securely within the tube. The retention cup assembly can fit within the cups of an ordinary brassiere, being held thereby against the body of the wearer. Alternately, the retention cup assembly can be sewn into the brassiere.