The ‘Freestanding’ underlay creates a mesh under the satin, similar to the freestanding background object type. This is useful when making Richelieu bars or satin shapes that will be stitched on wash-away stabilizer. When using the ‘Freestanding’ option, you do not need the other options, so you can leave them off. The Length, Inset and Density properties do not apply to the ‘Freestanding’ option.