Thin and shimmery.  I usually wear a small but since this seemed like it was going to be on the cheap side I ordered up to a medium.  Glad I did as I don't like my tops too clingy for the office.  The fabric does have a sheen so if you are looking for a flat cotton, this is not it.  Fabric is also very thin.  I want to make sure I wear a heavy t-shirt bra.  I am not going to complain for the price $14, but I only see getting one season out of these because they don't look like they would hold up to machine washing.  I'll likely wash these by hand.  I ordered several colors on my first order, but based on what I received I decided not to order any additional colors.