swimsuit push up top? at victoria secret?

i want to purchase a push up swimsuit one of the miracle bra ones but i was wondering if i can swim in them? and which top is better the halter top or triangle top for best cleavage and a bigger looking bust?

For halter you need at least some boobs because it doesn't conceal as much.
I'm not being mean, but it what I found irritating about the halter tops - everything I leaned down for a dive, you could see your halter loosening. I like triangle tops better.
And if you have a little tummy but great legs, I suggest a one-piece there's actually really cute one-pieces out there on the site (: