My late, great friend and mentor, Charlie Meyers, is the one who initially changed my mind on all of this. I used to be the guy who would see a trout refuse my fly and would size down to 7X even before I switched the fly pattern. Charlie said to me, "Deeter, you could tie a kite string to that bug, and if you know how to float it right, it will get bit." These days, I don't carry anything smaller than 5X, and 90 percent of the time, I fish with 4X or 3X. And when I'm really having fun with streamers, I use Maxima.