I was a little disappointed when I opened the package. Looking at these I figured there was no way they would have good support for a 38D (ordered an XL) when running. I'm losing weight and I didn't want to spend $50 on a quality high impact bra until I get to my goal weight. I put one on and got on my mini tramp and I was very pleasantly surprised at how well the bra supports. Will definitely buy again!
I originally ordered this in 32DD, my normal bra size. It fit around the rib cage, but was slightly too big in the cup. Since it mostly fit, I decided to keep it, but ordered a 32D as well. When it arrived, I was shocked to find that the 32D cups were barely smaller than the 32DD. Both fit well enough to work, so I am keeping them, but just be warned that if your girls are fuller on bottom (the way mine are) this style might not be the one for you. It does do its job, though, everything stays in place nicely while running!