This is a really good bra! Even for bigger cup sizes (bought 38E in UK sizes). The zipper locks when the tap is down and it doesn't unzip even if you try to pull it apart! I've used it for circuit training, bicycle rides and horse back rides. I find that for horse riding it doesn't offer enough support when trotting or cantering, but it might be that the bra is a lite to big for me. I am definitely buying one a size smaller and trying again. But based on this one I'd have to only recommend it for less bouncy activities. To sum it up: definitely worth every dine!