Boomba Ultra Boost Inserts Size C. Worn once, in excellent condition. Comes with 2 more brand new Boomba protective films for storing after future use. From the website: C fits bra sizes: 30E, 32D, 34C, 36B The most padded insert on the market. The go-to for that wow factor. Instantly boost up to 2 cup sizes. Recommended for tops with structure in the chest area. Triangular-shaped, best for low v-cut tops Boosts up to 2 cup sizes Double-sided adhesive for extra security Sweat and water-resistant