The double dry fly rig is often used to catch trout in situations when you can’t tell what the trout are eating. The double dry fly rig is effective because it presents two different fly options at the same time. You can also use two of the same type of fly if you prefer, but most anglers will vary their fly selection. This rig works especially well when fishing during times of insect hatches.
To make the double dry fly rig, use an improved clinch knot to tie a piece of tippet to the hook in the spot where the hook bends. This allows you to cast out two flies at the same time.