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I'm a 30D or 32DD, so I'm always skeptical about ordering bras that are Small, Medium, etc. I went with the Small. It fits around my rib cage but, as expected, the cups are a bit small. With sports bras, I'd rather go too small than too large, so there's more support. Works great for running, but of course there's some "side boob". If you're fine with a very tight-fitting bra, this is perfect.
The ad says true to size so I ordered a small as I am a 32C. It was so tight! I could hardly zip it up. I finally got it zipped but wow! It was tight. I LOVED that the zipper is in the front though and it is very cute. The cups are padded and not removable which is great for me. I hate having to adjust the cups once the bra is on. I'll be returning and purchasing a larger size.