Strapless bras that have plunge fronts are in great demand for bridal gowns, prom gowns, sexy sundresses and other strapless fashions that require heavy-duty boosting of "the girls." Plunge fronts help accentuate and showcase your cleavage beautifully. Longline bras, corsets and bustier styles help whittle the waistline via boning and powermesh stretch fabric that smooths your tummy, sides and back. Adhesive plunge strapless bras are particularly great if you have a very low or backless dress as they adhere to the breasts with silicone. Push-up styles are also available, with graduated padding at the bottom of the cups to elevate the breasts and produce more cleavage. Cups that go up to size G require supportive features like boning at side seams. HerRoom carries an impressive array of these sexy bras, and offers free shipping with qualifying purchases.