to the rear of the fabric to provide improved light absorption. To create a coated fabric, a liquefied rubber polymer is applied in a single coat to an uncoated fabric and subsequently fused dry by means of a heated roller, in much the same way that a laser printer applies toner to a sheet of paper before fusing it dry. A fabric that has been through the coating process once is considered a "1-pass-coated" fabric, anecdotally referred to as "dim-out" or "blackout" because of the fabric's ability to absorb approximately 50-70% of a direct light source. To improve the light absorption of a fabric it is possible to re-coat a fabric up to a maximum of "3-pass-coated", which is considered sufficient to block out 100% of a direct light source, hence such fabrics are referred to as "blockout-coated". Maximum light absorption and heat insulation in a curtain is created through a lined curtain, which typically consists of an uncoated fabric at the front to provide the look and feel of the curtain, with a separate coated fabric attached at the rear to provide the insulative qualities. The coated fabric is typically referred to as a lining, which simply refers to a coated fabric that does not have any particular color or pattern. Curtains may be held back with tie-backs (a loop of cloth, cord, etc., placed around a curtain to hold it open to one side; typically passed through a ring on a hook attached to the wall, and fastened with a knot, button, or velcro; often adorned with tassels) or may be closed and opened with sticks called draw-pulls (rods made of plastic, wood, or metal that can be twisted and/or pulled) or curtain rods which are attached either to the runner or to the first hook. A curtain hook stopper is a device used to stop the curtain from falling off the end of the curtain rail. Although some curtains may employ pulley systems, they should not be confused with roller blinds or roller shades. They may be generally referred to as window treatments, which are cover or modification of the window, often with the aim to enhance the aesthetics of the window and the room. Styles Curtains can be used to give a room a focal point. There are at least twenty different styles of curtains and draperies which can be used in window treatment. Flat panel