Full Illusions (1 pair silicone inserts for all tankinis and bikinis). These silicone breast insert Enhancements are safe and easy to use, and they give you the natural, full-figured look you've always desired. Illusions  will increase breast size 1.5 to 2 full bra cup sizes, and can be used in salt water or chlorinated pools. Let Illusions enhance those curves you love. These "secret" inserts fit into the hidden pocket on every Hapari Tankini, and Bikini.