Double-running stitch is an embroidery stitch that starts as a running
stitch which doubles back on itself. This results in a reversible
pattern, producing the same finish on the back as the finish on the
front. Made from two passes of the thread, this stitch gives a neat back
and is therefore used for Blackwork. The double-running stitch employed
in Blackwork is often called Holbein stitch.
It is a very versatile stitch as well and works well to make strong
seams in garments. It creates a reversible design. Double running stitch
can also be run in two colors giving an interesting effect.