Logos have glue on back for iron immediately before sewing patch on fabric. Beautiful logo use the thread, colors will dark or light from refraction of light If the embroidery is thick and dense or Thick Fabric. it is reCommended to sew around the edges again to prevent the logo from falling off. Hats and shoes, should be sewn along the edges of the logo so that it does not come off.Or use with Heat Press machicne. For non-fabric parts, hot glue can be used.