I ran in this for the first time. 8 miles in the heat and the tank was comfortable and cool. The back is racerback, and a little more cutaway than my running bra, but it is not gaping in the arm pits or anything. It is a fairly functional top, but on the narrow part of the racer back there is a little silver reflective horizontal stripe that gives it a little bit of a "current" look. The material on the back is lighter in color and more of a mesh. The fabric on the front breathes and is not mesh, but you can't see your belly button through the fabric like you can on mesh tanks. I am 5'3" and 129 lbs and bought a medium and it fit fine. I think this runs a little smaller than a Nike tank I have I have in the same size (similar style). My only complaint is that I thought that Ruby was more of a "true" red. I bought it to go with a red, white, and blue running skirt that I have, but this tank has more of a pink hue to it, even in the front where the darker fabric is. The color is attractive and current looking, but not a primary red if that is what you are looking for.
From couch to marathon