Hello unicorn bra.  It's supportive enough for heavy exercise, but comfortable enough to wear every day.  I am every bit of a 36 D, and don't like anything too snug during races (hello, chafing).  Yet, I still need something to keep myself from bouncing all over the place, especially during long-distance races or high-impact training.  This manages to be snug enough to keep things under control, but relaxed enough to be comfortable (and that I don't need to feel like I'm wrestling just to get into), and still to look cute. The underwire is supportive, but the construction of the bra ensures no chafing.  My first big test of this bra was during a warm, humid, half marathon.  Once it was on, it was so comfortable that I forgot it was there, and the construction in combination with the moisture-wicking material kept me dry and chafe-free.  This bra is worth every penny, and I plan to get more in different colors in the future.

One thing: by virtue of being a sports bra, this does fit a bit snug.  One might want to consider getting one band-size up.