Push up bras are fashion bras that enhance cleavage by pushing the breasts upwards and towards the centre of your chest. You can wear them any time to give yourself the look you want. They work particularly well when you are dressing up and want to highlight a décolleté or low-cut neckline look with a dress or top. The Wonderbra with its famous ‘Hello Boys’ advertising was the first push up and sales took off in the 1990s in the UK, Europe and the US. Today’s push up bras are made with foam or silicone gel padding on the inside of the cups to lift up the breast and give a sense of increased volume. Typically about one-third of the base of the bra is padded. For smaller breasted women a push up can give the appearance of increased cup size and give a rounded and fuller look but they are just as suitable for bigger busts.