The best part is, when you are ready to fish, you can thread the tippet through the eye with the fly still on the foam (you can either tear off the individual tab, or twist the whole booklet to help you tie your knot). Then simply detach the fly from the foam, maybe add a dab of floatant, and you are good to go. I've been monkeying around with this for a few days now, and believe me, it makes all the difference in the world. Fewer dropped flies. Better, faster knots. And the frustration factor decreases exponentially.