Like other reviewers have noted this bra does tend to loosen up a little during wear. For me, however, this has not been a problem! I am right in between sizes and I had ordered the smaller of the sizes (32C). The band stays the same but around the bust it gives a little but not enough for any bouncing. It was a little tight when I first put it on but now it is perfect - wear, after wear. The closure on top is easy when you figure it out. The comfort leve is high whether I am running (5+ miles) or doing the Beachbody Insanity workout. I will order more of these for sure!