38 DD and they just keep a jigglin. You definitely will need to wear another sports bra on top to prevent movement. I was hoping to finally find a sports bra that does all the work on its own. This wasn't it- still rockin' 2-3 bras when doing rigorous activities to prevent giving myself a black eye. If anyone reading this has suggestions for one amazing sports bra please do share. It's the right thing to do.