I have it on right now and it doesn't even feel like I'm wearing anything. Really like that a lot! Anyhow, it is a thin stretchy material. Something you'd wear with bra discs to "dim the headlights" look...
(bra discs not included, but highly recommended!!)

I got the nude color. It's nice.

It's not super supportive. It's like a soft sport bra really. It's a slip over your head type, which I like.

If your chest size is like the model in the picture, then you may like this bra. If you're not...you might want to look elsewhere for "real" support.