The selvage edge of a fabric is the tightly woven, finished edges that run along the lengthwise grain of the fabric. It is typically found on both sides of the fabric and is designed to prevent the material from fraying or unraveling. To find the selvage edge, unroll your fabric and look for the edges that are different from the rest of the material. They may have a different weave, color, or even manufacturer's information printed on them. The selvage edge is usually more tightly woven and may feel firmer than the rest of the fabric. This is the edge that is meant to be stable, preventing the fabric from losing shape or distorting while it's being sewn or handled.