The only distinguishing feature is the thickness and heaviness of the material. These type of curtains have a quilted construction that increases the thickness of the panel by two to three inches. The quilting can be either done on both the sides, that is, back and front of the drapery panel, or only at the backside of the panel. Some drapers use the bottom hem of the panel to add weight to the curtain so that it does not move with the breeze, or any other reason.