I am a 38D and I love this bra so much I own 3 of them and will probably buy a 4th next running season.  This bra is the only kind that is NOT underwire that makes me feel like I don't even have breasts!  Also important is that it's design separates my breasts just enough so they aren't touching (and so I don't get sweat build up in between).  Also the straps are easily adjustable (size fluctuates monthly)!