Avia Seamless Front Zip High Impact Sports Bra in Color Black Womens Size Small. Racerback design. Light use and washed once, It was too tight on me. I would say it runs more like an XS. The zipper in the front and padded cups gives great lift and a secure feeling. Measurements are taken buttoned up and laid comfortably flat then X2 for total circumference (inches) Length from Front: 5” Length from Back: 9” Rib Cage: 21” Pit to Pit: 21”