Bra cups are the padded or shaped sections of a bra that provide support and coverage for the breasts. They come in various sizes and styles, designed to fit different body shapes and preferences. The size of the cup is typically indicated by letters, such as A, B, C, and so on, which correspond to the volume of the breast. Bra cups can be made from various materials, including foam, fabric, or silicone, and may feature different designs like underwire or wireless options. Some bras have removable cups, allowing for customization in support and shape. Overall, bra cups play a crucial role in comfort and fit for those who wear them.