Smocking - Gathering Thread 200 m (220 yds) Art. 9662 100 % Polyester Madeira ‘Smocking’ thread is a special yarn which reacts to heat.  Stitch the fabric using Madeira Smocking in the bobbin. Run a warm household iron over the stitched fabric slowly and the thread will react to the heat, creating controlled gathering whilst the fabric is unaffected. The rippled or crinkled effects are beautiful and limitless. No special needles are needed, and shrink embroidery can be created on any type of home sewing or embroidery machine. Smocking works well on all home sewing and embroidery machines. For best results we recommend the use of the MADEIRA universal sewing needle 80/12.