The adhesive does stick initially (and wow is it uncomfortable to peer off yourself like a second skin) but it isn’t strong enough to hold what it needs to unfortunately. It is sticky but not strong. I bought the size D-DD as per my cup size in standard bras, but the item can’t hold the weight it’s trying to support and starts to unstick within 10 seconds as a result. Might very well work for a much smaller cup size but for larger chested ladies I would honestly say please don’t waste your money. It’s an item that can’t be returned once you’ve opened the box to try it on.