Our satin is "Bridal" satin, which is the grade used in making bridal gowns.  It is composed of acetate, and is a heavier, thicker, more luxurious satin than the polyester. It has two definite sides to it.  The correct or "top" side is frictionless and bears a strong luster.  The reverse side is somewhat dull, and bears the grain of the fabric.fabric than more commonly used sheet materials.