I love the construction of this bra top it has good body length, the inner bra is fabulously soft and it is a little bit racy! Sugoi say that this bra is supportive enough for A-C cups to run in and larger cup sizes would need to add extra support or wear this tank for lower impact activities. Very popular with triathletes, a superb crop top. A medium equates to a size 12. Full length tank version also available.