I like this product for keeping my bra straps up. It gives a slight lift and enhances cleavage, but I don't notice a full cup size difference.  As a bonus, it forces me to keep my shoulder back, improving my posture without restricting my movement like the posture correcting devices did. I have been wearing this daily since I got it. I threw out the posture correcting device because it was painful and restricting. Strap Perfect is small, lightweight, undetectable under clothing, easy to put on, and remove. It comes in black, nude, and clear - two of each color. The only down side is your bra straps will be closer to your neck and easier to see if you wear a t-shirt neckline. Recommend this product!