Unfortunately, they don't work for me at all. I contacted their customer service, and to be fair, they were helpful and tried to figure out whether the issue was the size I selected or my dress, but both were fine. I still have two unopened packs because, well, the ones I opened are completely useless to me. I think they're designed for people with very large or very saggy breasts, or perhaps very small ones. If you're somewhere in between, don't expect much support. They're definitely not going to provide enough support to wear a dress without a bra. I mean, they certainly can't replace a bra.

This does NOT do what you see in the advertisements.

Lasted all day with no problems with moving