GÜTERMANN Cotton 30 is a 100% mercerized cotton sewing thread designed for ornamental stitching and seam finishing on medium-to-heavy fabrics. This 300 m spool in Rainbow Flowers creates a more dimensional stitch look and is suitable for both hand and machine sewing on wovens, denim, and similar materials. Stitch a short test seam first to balance tension and needle selection, especially when working through thicker layers.