I'm a 38DD in bra size and ordered an XL. I do not like sports bras to be too tight, so this fits just right for me. I also don't do a ton of high impact. I think if I was going to run in it I'd maybe size down for more compression. The straps are pretty skinny for those of us bustier ladies, so if you have sensitive shoulders I'd probably pass and get something with thicker straps.I wish companies would just tack the cups in place so they don't get messed up in the wash, so I'll have to do that myself.I love cute bras to workout in but am not willing to pay tons of $. As a bustier 36C woman, I have to have something with more support. This gives all the support, comfort, & flattery you could want. I will say however, my only negative is that based on the size chart, the Large, which is what I ordered, is almost a bit too small. I’m not broad shouldered by any means, so I was a little disappointed by that. I do still continue to wear it & receive lots of compliments, I just hate that it fits a bit snug on my back & shoulders.I absolutely love this sports bra! It is so comfortable! I went ahead and bought 3 colors! It fits me just right and I generally have larger breasts (even after a reduction). It is tight enough to run up the stairs without having to hold my breasts, but light enough to wear all day and even sleep in ( I usually don’t wear a bra to sleep)! Definitely just purchase it!I have worn Nike and Adidas bras forever. These, by far, are my favorite. I have several pairs of this bra in multiple colors. The support is great. I am a 36C and wearing an XL. I highly recommend these. I just bought more today!36C I usually wear an Xl in bra tops, this was just a bit too tight for me. Like the style and love the strappy back. Will exchange for a size up.Considering this is advertised as a runner sports bra I expected it to be a bit sturdier. Instead the fabric feels flimsy and not as supportive as a vigorous exercise bra should be. It's pretty cute, but honestly as a runner, I'm more concerned about support and stability than looks.I love the comfort and color of this sports bra. But, I am a 36C and I went according to the size chart and got a Large and it’s big. If doing cardio there is no holding the girls down they bounce. If you are wearing for other than cardio then it’s amazing! I love it just not when running.This sports bra is basically perfect. The fit is comfortable and flattering. One feature that I really enjoy is that the cups don't get all bunched up in the washing machine.Muy cómodo y excelente soporte