I'm a runner, fitting a regular bra between a DD and DDD, depending on the manufacturer. I ordered the 34DD, and I think it fits me well, without any flubbing or smooshing (than typical). However, I didn't think this had the support that others are saying it has. Could just be me, but I asked a trusted friend to give me her honest opinion, and she felt I still had a lot of bounce going on. Comfort-wise, I felt fine, but she said as an observer, she was surprised that it didn't offer better control of the bounce and shift when I moved. So would I order them again? No, probably not. Is it comfortable, nice material, well constructed? Yes, I think so. But I've worn others that offered better control.