A bra cup molded by thermoforming comprises a layer of thermoformable polyurethane foam as well as an inner fabric and an outer fabric bonded to the foam layer. The outer fabric is composed of a three-dimensional knitted fabric comprising a first face and a second face separated from one another by a thickness of the three-dimensional knitted fabric that is greater than 1 mm. The method for manufacturing the cup comprises a molding step, and in a bonding step preceding the cup molding step, said first face and the foam layer are bonded together.