Under Armour purple sports bra size inside

Under armor sports bra. It is purple. It has the under armor logo on the front. And under armor is printed on the back. It is a Racerback. No padding. It has the under armor tag inside. But no size tag. So from seam to seam, under arm, is 15 inches across. From the top shoulder to the bottom hem of this bra is 12 inches. no stains, rips, or tears.