Push-up: A fashion bra that creates the appearance of increased cleavage. Uses angled cups containing padding that pushes the breasts inwards and upwards, towards the centre of the chest. A push-up bra is usually a demi-cup bra. The Wonderbra was the first push-up bra made.
Push-up bras basically push your breasts upwards and closer together to naturally enhance cleavage. The padding on the inside of the cups is made of silicone gel or foam to lift up the breast tissue and visibly increase volume. One-third of the base of the bra is padded (either graduated padding or a slight bump).
Smaller breasted women can benefit from push up bras as they can increase cup sizes and give a rounded and fuller look. For both small and big bust women, push up bras can create cleavage as the lift brings the breasts closer together at the centre.