I tried this cami bra to keep the "twins" from spilling out over the top of the lower cut bras and it really worked out well.  I got a 36DD because I guessed a sport bra would run small and I was right, I usually wear a 34D or DD.  The only complaint I have is that the sides could provide a little more coverage and the side cups are a little short but it fits great and provides a lot of support without wires.  It has a seamed cup, which actually gives me a shaping effect and no uni-boob.  I got another brand and didn't like the uni-boob look and sent it back.  I will order another one of these instead.