I ordered one size up in the back, as this was strongly recommended on the website and in reviews. In my case this meant that the band around my ribs was not tight enough and therefore the whole point was lost, of holding my boobs still while running.
Additionally I had not really focussed while ordering on whether the sports bra was wired or not. I focussed on the fact that this bra is 'maximum impact' and marketed as suitable for running, horse riding or the gym- it sounded suitable for running if you are a GG sized woman. In reality when I tried it on the lack of underwriting meant that basically the boobs are squashed to the chest, and also squashed together, with no shape and no definition. The feeling of my boobs being squashed together like that made me feel sweaty and uncomfortable - and that was just standing still!
I tried various tops on with the sports bra and this confirmed my bad feeling - I looked massive, barrel shaped and with the bra not feeling tight enough around the ribs I would not have attempted running in this bra. A sports bra may not be 'lingerie' and not the most sexy item ever.... but I still want to feel attractive in it.