GÜTERMANN Cotton 30 is a mercerised cotton sewing thread designed for quilting, sewing, and topstitching with 3-dimensional stitch definition. This 300 m (328 yd) spool in Deep Rust is made from 100% cotton for seams and decorative stitching on woven fabrics. Choose it when you want crisp stitch definition, and fine-tune stitch length and tension on a test piece before starting This helps keep your stitching consistent across different fabric weights.