Underlay is also known as base layer. It is used to tighten the fabric enough to avoid its deformation when stitching on it. The underlay stitches should remain hidden under the main fill.
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You can select the proper type of underlay and its properties according to the fabric / material and the design properties. Underlay types include: centered, edge, zig-zag, parallel, etc.
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Centered Underlay on Path with Zig-Zag Stitches |
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Edge Underlay on Path with Zig-Zag Stitches |
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Double Zig-Zag Underlay on Path with Zig-Zag Stitches |
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