This is our most popular bra. The cups open with a new, one-handed, easy-open, easy-close clip. The cups are seamless, with beautiful separation and uplift. Under the cups is an under-the-breast supportive seaming, which provides the support of a wire without the wire. Smooth, clean, perfect under tees. 83% tactel nylon/17% LYCRA - this strong, supportive fabric is very soft, with great strength, to support the breasts as they change during the day before and after nursing.