An attachment for the edge of an extending brim of a baseball type cap or visor is disclosed which is mounted on the edge of the extending brim to protect or repair the edge. The attachment easily mounts on the brim of a cap or visor and remains securely thereon. The brim is inserted into a slot through the side and along the full length of the attachment. The slot has flared edges that permit the attachment to be easily attached to the brim edge. As the edge attachment is mounted on the edge of a cap or visor the flared edges are deformed outward creating a spring force that firmly holds the edge attachment on the brim. The edge attachment may have an extension that extends over the top of a brim to provide additional space for the display of words, graphics, etc. that are larger than can be displayed on the much narrower front or top edge of the attachment. Barbs on the inside of the edging attachment near the slit bite into the top and bottom of the brim to further assist in holding the attachment on the brim.