Pull the String for Instant Lift: In the middle of the large cup strapless dress bras, there is a drawstring that you can use to adjust the perk. You just pull the string tight after you place the strapless push up bras cups on your breasts. And then you will get a support and push making you look a bit bigger in that area. your breasts look bigger and full.2 Packs Invisible Bras to Fit Different Clothes: Push up dress bras give you the cleavage you needed without having to wear an actual bra. Self adhesive sticky bra for women is thin enough so there are no visible bra lines under shirts. You do not have to deal with shoulder and back pains because there are no straps and you get the feeling of not wearing a bra even when you are wearing one.Skin friendly and Sticky: Drawstring bras for women are made of natural and harmless silicone material. Just enjoy your time because there are no irritation or itching. Not only do the bra for strapless dress actually stick, they somehow do not leave any kind of sticky residue after several uses. Do not worry about slipping or peeling.