Sport climbers, who take multiple lead falls, often use The Double Bowline Knot as a tie-in knot because it is easier to untie after a weighted fall than a figure eight knot. However, this knot is not as secure as the figure eight knot for climbers. The knot can have a tendency to slip, so it is best coupled with a stopper knot.
The Double Bowline Knot was first named by Clifford Warren Ashley. The knot goes by several different names including the Double bowline, the Round Turn Bowline, and Double-Knotted Bowline. Other related knots are the Bowline, the Water bowline, the Double sheet bend, and the Bowline on a bight.
Clifford Warren Ashley (December 18, 1881 – September 18, 1947) was born in New Bedford, Massachusetts. He became a sailor and knot expert as well as an author and American artist. In 1944 he published The Ashley Book of Knots, a reference manual that listed thousands of illustrated knots with directions for tying. It is a reference book that is still used today for knot tying.