In Panache bras I'm a 34F and this definitely supported the girls very well for a strapless bra! I did the jumping test and everything stayed where it should. Fit perfectly (see below for more info). It has grip to it and the cups are fully wired so the girls definitely stay in there!I've bought nothing but Panache bras and swimwear since 2010 and I can tell you that they are seriously the best. I bought the same size I wear in everything else I buy from them and it fit perfectly. If you want solid sizing advice, regardless of what other posters have been saying, go into a custom bra shop nearby, try on any Panache bra and that's the only size you'll ever need to remember when buying any other Panache product. Unless you lose or gain weight, then you'll be playing the try on game more often. I've bought many different styles from Panahe and it doesn't matter, it all runs the same size. They aren't an American company so the quality is always high and the sizes don't fluctuate. So, instead of listening to people comparing this to bras from other companies, where they may not have been sized properly, go into a store with Panache, get a proper fitting for the brand, and you'll have a perfect fit here.I especially love this since it comes with removable straps and you can cross them in the back to wear racerback shirts without your straps showing! I'll definitely order more of this style!