I ordered the size Medium, based on the reviews. I generally wear a 34B or 34C. Although it looks cool in general, the cups form a bandeau shape, are too small for a "medium" fit, and don't provide any support whatsoever. The band itself is flimsy or slightly loose, provides no support, and there is no way to adjust it to make it tighter. The material is like a swimsuit too, so it's definitely not suitable as a sports bra.