I bought this in my search for the perfect t-shirt bra; one that supports, provides enough coverage that I can be moderately active without falling out and disappears under clothes. It did all of the above, so full marks for that. It also gives a very rounded shape, but if you wanted anything remotely resembling cleavage, look elsewhere. I have full breasts, and they were practically in my armpits, this bra pulls them so far apart. The band is a tad on the tight side too, so if you're between sizes, think of going larger. It is also borderline ugly in person, which is sad. Can't we be sexy in nude?
I did wear this exclusively on a 10-day backpacking trip in the Bob Marshall Wilderness (slept in it, most times), and it was amazing for that. Very breathable fabric and easy to clean. If you don't care much about looks, this is the one to get.