There are other bra inserts that has air or even water inside and this is good because it follows the natural shape of your breasts. Today, the type that is getting good reviews and is becoming one of the most popular types is the waterproof bra inserts. It is also made of silicone and most women prefer this type of bra inserts because it can be worn even under your bathing suit. You can even wear it under your bikinis to get the push-up that you need to make your breasts bigger. This is truly an amazing discovery so instead of undergoing the painful process of surgery, you can use bra inserts instead.