I was looking for a tank that I could wear alone or under other things and which would be suitable for the summer's heat and humidity. I did not expect to look like the model (who obviously has no need of firming) but was hoping that the tank would just smooth things out a bit.  It did not do either.  The tank is actually made of two layers, the outer layer is a cotton ribbed tank with lace along the straps and neckline, which is a nice touch. The cotton fabric seems fine.  The straps do not cover the bra straps well and the back of the armhole is cut in such a way that a racer-back bra would need to be worn.

Then there is an under layer of a stretchy material, which has no more firming or smoothly capability than a normal stretch camisole.  The cotton and stretch layers are attached to each other and sewn into one hem, attached together all the way up the sides and up around to back of the neck line, which is supposed to, I presume, smooth one's back fat.  This did not happen.  The front of the  under layer stops just under the bust line, ostensibly not to squash your breasts; though with the "firmness" of the under layer there is no danger in that happening. Also since the top of the under layer is not attached to anything it rolls downward and forms an uncomfortable ridge on your chest under the bust line.  Between it rolling down and the weird hem consisting of two completely different types of fabric bunching upward, it is not comfortable.

The concept would be better served with the cotton outer layer as is, with maybe slightly wider straps.  The under layer could be made of a somewhat more firming fabric that is only attached to the outer layer in a few spots such as the strap tops, around the neck and then allowed to hang separately including at the hem.  I think the uncomfortable fit during wearing and moving is due to these fabrics with two different ways of draping and stretching being sewn together.  Also given the composition of these two different fabrics being sewn together as they are there is no telling what would happen once the garment was put in the wash.