grosgrain

thumb|A close-up of a piece of grosgrain ribbon. Note the ribs that go across the ribbon. thumb|Grosgrain ribbons in various colors and widths

Grosgrain ( , also sometimes ), or grogram, is a type of fabric or ribbon defined by the fact that its weft is heavier than its warp, creating prominent transverse ribs. Grosgrain is a plain weave corded fabric, with heavier cords than poplin but lighter than faille, and is known for being a firm, close-woven, fine-corded fabric. Grosgrain has a dull appearance, with little luster in comparison to many fabric weaves, such as satin, often used for ribbons; however, it is comparatively very strong. Grosgrain fabric is most commonly available in black, but grosgrain ribbon comes in a large variety of colors and patterns. The ribbon is very similar to Petersham ribbon in its appearance, but it does not have the ability to follow the curves of a surface or edge the way that the latter does.