If you're between sizes or on the edge based on the size chart, go down for a more supportive fit. These bras seem well made. Depending on the bra I wear 34DD (which is hard to find), so I usually have to buy a 34 D or 36D. Medium tops are fitted on me and large tops are a little more roomy and what I consider comfortable. I bought an XL based on the size chart, but the bars were too loose. Shouldve sized down for more support. They feel like a no support bralette at this size.