It was suggested I buy a Small, after reading some of the reviews I decided on a medium. I could tell the quality was great, it was exactly what I was looking for… However the band at the bottom run small. I am at 34C, 125lbs and this was way too tight around my rib cage, the bust area fit fine. So I sent it back and I ordered a large. Will update when it arrives.keep the cups cause kinda looseLet me preface this by saying that I'm pretty picky when it comes to activewear...I was looking for something with more of an open back, and I came across this one.This sports bra is great, especially for the price. The quality seems good. The fit is nice, and it doesn't irritate or rub like some sports bras do!For reference, I'm 5'3/128lbs/32B with an athletic build, and a small fit perfectly in the A-white style :)This fits so nice that I forgot I even had it on today. I'm 135lbs & im 5"1, I bought a medium & it fits like a charm. It's a nice silky texture & it doesn't rub. Im going to buy at least one more & they will be my new running bras. Since this winter has been extra dry for me it doesn't rub under my arms & create rawness. Im so thankful for this bra!! Athletes! Say NO to cotton & purchase this bra! ??I didn’t expect some amazing, super high quality product for the low price but I wouldn’t probably buy again. It fit pretty tight so I should have sized up for sure. But it’s just not very comfortable to wear. Especially during workouts and if you start to sweat at all.I am a size 10 and 36C. I first ordered a large, but had to exchange for a medium because there was extra space in the cup/ armpit area. Now that I have the correct size, I love it.Loved the looks of this, but it didn’t fit me me quite right through the bust; I’m a 34C and bought a large…it seemed OK at first, but the longer I wore it, the more uncomfortable it became. Bummer, I really wanted to like it! Back it goes.I love this bra. The material is so soft but yet provides excellent support. The straps are wide so does not cut into your skin. It appears to be be of good quality. It is pretty and stylish. It is everything I look for in a sports bra. Love it!!