30DD Bras, Lingerie, and Swimwear | 30DD Bra Size

A 30DD bust requires the right balance of support and shaping, and HerRoom carries a variety of styles to suit different needs. T-shirt bras provide a smooth, seamless look under clothing, while balconette bras offer a slight lift for a natural, rounded shape. Full-coverage bras ensure maximum support, while plunge bras create a flattering neckline for low-cut tops. If you prefer a wireless option, soft-cup bras provide gentle shaping without underwires. With a well-fitting bra, you can achieve both comfort and confidence in your daily wardrobe.

If you’re looking for the best 30DD bras for women, then you’ve come to the right place. We offer a wide assortment of styles, brands, and sizes at HerRoom. Whether you’re looking for everyday bras, sexy lingerie, or bra-sized swimwear, we offer options designed to provide the lift and shape you need — without compromising on style. We’re simplifying the shopping process, making it easier to find consistently great-fitting lingerie and 30DD swimwear across different collections.

A 30DD is not necessarily "big," but it does indicate a fuller cup with a smaller band size. Since bra sizes are relative, 30DD bras have about the same cup volume as a 32D or 34C, just with a tighter band for more support.

A 30DD is equivalent to a 32D, 34C, or 28E in terms of cup volume. However, because different brands use varying sizing systems, using HerRoom’s Universal Cup Sizing™ (UCS) helps find the best fit.