This was a joke for my 36DD.  The first time I wore this and attempted to jog, I didn't make it 30 seconds due to all the bouncing.  My breasts hurt.  I personally feel this is only for low impact activities or better yet to wear for everyday activities, because this didn't even hold up to me using the elliptical.  It's just a regular bra, that they added some extra cloth to and thought it would work well.