The Turle Knot has several variations, and the one we have here is considered an “Improved Turle Knot.” It is used to tie a fly with a upturned or downturned eye to a line. Lefty Kreh advocates an adjustment to this knot by pushing the tag through the loop and only after that tightening the knot against the hook. The Double Turle Knot that we show here uses two loops held by an overhand knot, with the loops securing the tag end. Another variation is to add one more turn on the knot, creating a Surgeon’s Half Knot. Learn how to tie the Turle Knot following the 5 simple steps below.