Especially for larger cup sizes.  Keeps those puppies STILL so long as you get the correct size.  I recommend getting one band size (get regular cup size though) smaller for the best anti-jiggle effect.  I made the mistake of getting a 36D (my regular size) this time when I should have gotten a 34D (as I got last time) and I notice that while the 36D is okay, I always go to the 34D when I want serious bounce protection.  Overall, a good quality, comfortable exercise bra.