So I'm between a 36DDD and a 38DDD. My recent weight loss has made my 38DDD bras too large. Normally wear a XXL sports bra and went down to an XL but they still give me no support when running. So I tried these. I tried this one and went up both around and in cup size because of the way the other one fit. I got a 38E and it fits perfect on the tightest setting on each strap and for each hook. I still have some bounce when running but not a ton and not painful like with regular sports bras. It's not super stiff like the other one was but still holds me in place much better than sports bras from Target. Will buy more.