I am 34DD and I go through a lot of sports bras. I did not return this one because I like the color, and once I get it on it works okay, but I would not use this bra for running. It offers me medium support and I am a little smooshed in this one. I thought I would have more two-boob definition because of the picture, but the shirring in the front does not completely prevent a uni-boob. I have to pull, push, and adjust myself into this bra more than some others that I like, but the color is pretty and it is comfortable. I kept it because it matches some of my work-out clothes so well and it works sufficiently well for yoga and some dance classes.