The Loop to Loop Knot, despite its name, is not a knot but a way of interlocking two loops. This connection is very strong and fairly simple. But you do need to make sure to avoid making a girth hitch by folding the loops the wrong way. Quite a few fly lines now come with pre-tied loops, so all you need to do is tie a loop at the end of the leader using a Surgeon’s End Loop, Perfection Loop, etc., and then connect the two lines using the Loop-to-Loop Knot. Learn how to tie the Loop to Loop Knot following the 3 simple steps below.