I ordered a 34D, which is my usual size in sports bras.  I had to return it because it was extremely snug around the shoulders and dug in at the slightest jostling.  I am a runner and am used to the restriction of good run bras.  This was not that.  The next size up may have been better but I took the refund and put it toward an old reliable that is somewhat more expensive (read $60, jeesh).  I think the bra would have done well wicking wise and provided enough restriction had the sizing been right.  I really wanted to NOT spend 3x as much on a run bra but stick with what you know I guess.