This is an excellent top for running and other high-impact activities (aerobics, racquetball), and I can wear it solo without an additional sports bra.  It keeps my core dry and comfortable, even when the rest of me is dripping in sweat.  I like the longer torso length for when I'm reaching over head.  It is snug to wear across the chest so I have to "shimmy & shake" to get it on but once it's there, it's comfortable and keeps my breasts lifted (which, after 4 chidren, is a feat in and of itself) and supported.  The waste & hip is a bit looser, not constricting, so there's no buldge for my mummy-tummy.  I'm 5'2", 108#, B-cup, and wear an XS.