To all you women out there with more than the average bust - listen to me.  I am 44DD and take a cardio class with lots of running, jumping, and other boob-unfriendly activities.  I was in pain from things bouncing around and nearly gave myself a black eye during each class.  Stop laughing!  It's true.  I found info on this bra on some runner's forum and I think to myself huzzah! this is what I need.  I looked online for local retailers (sorry Amazon, my next one will come from you!) and went to get one.  My god! the difference this bra makes.  I wore it today to my cardio class and came home with no pain in the bust!  I love this bra.  Yes, it fits snug, so if you're used to the way your regular bra fits, then this will be a little different.  Nothing moves in this bra - not during jumping jacks, not running in place, not doing kickboxing.  BUY THIS BRA - YOU WILL NOT REGRET IT.