PATENT PROTECTED Perfect Boost Inserts are abalone-shaped inserts that increase your cup size by one cup. They give your bust a fuller look when you wear those plunging necklines and low-cut dresses.   * Prevents nipple slips in low-cut tops * 100% sweatproof and waterproof * Interchangeable between outfits, no sewing needed * Lightweight and super comfy to wear Unlike a sticky bra that is supported by adhesive, BOOMBA inserts are supported by the clothing and cannot stay up by themselves. It is crucial to wear them in tight, structured, and fitted tops. Have augmented breasts? Please check our FAQ section to see if they are suitable for you.