PATENT PROTECTED This padded insert is specially designed for demi cup styles. Stick it inside wedding dresses, bras, bandeau bikinis, etc. for a natural-looking boost. Natural-looking boost designed for demi cup style clothing Boosts up to 2 cup sizes Prevents nipple slips in low cut tops Insert stays put and keeps clothing in place Interchangeable between outfits, no sewing required Our inserts are not intended for individuals who have sensitive or thin skin or women who are pregnant or breastfeeding. Unlike a sticky bra that is supported by the adhesive, BOOMBA inserts are supported by the clothing, they 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. The sizing guide below only serves as a guideline. For the most accurate fit, please measure your garment and contact us. Kindly take note that Ultra Boost Inserts come in different cup sizes. Demi Boost Inserts: CurrentBra Size US 32AU 10EU 70FR/SP 85 US 34AU 12EU 75FR/SP 90 US 36AU 14EU 80FR/SP 95 US 38AU 16EU 85FR/SP 100 US 40AU 18EU 90FR/SP 105 A Demi Boost SizeAA Demi Boost SizeA Demi Boost SizeB Demi Boost SizeC Demi Boost SizeD B Demi Boost SizeA Demi Boost SizeB Demi Boost SizeC Demi Boost SizeD Demi Boost SizeE C Demi Boost SizeB Demi Boost SizeC Demi Boost SizeD Demi Boost SizeE Demi Boost SizeF D Demi Boost SizeC Demi Boost SizeD Demi Boost SizeE Demi Boost SizeF Demi Boost SizeG DD/E Demi Boost SizeD Demi Boost SizeE Demi Boost SizeF Demi Boost SizeG Not Recommended DDD/F Demi Boost SizeE Demi Boost SizeF Demi Boost SizeG Not Recommended Not Recommended DDDD/G Demi Boost SizeF Demi Boost SizeG Not Recommended Not Recommended Not Recommended H Demi Boost SizeG Not Recommended Not Recommended Not Recommended Not Recommended Tip: always size down if you're in between sizes for a seamless fit.