A foam bra is a type of bra that uses foam padding or cups to create shape, support, and lift for the bust. Foam bras are often used to add volume or to enhance the natural shape of the breasts. The foam cups can be made from various materials, including synthetic foam, gel, or air-filled padding, and are designed to mold to the shape of the breasts for a smooth and natural look. Foam bras are available in a wide range of styles, from balconette bras and push-up bras to sports bras and t-shirt bras. The type and thickness of the foam used in a bra can affect the level of lift and support it provides, so it is important to consider the intended use of the bra when choosing a foam bra.