Tying 3X tippet to a size 20 midge is like tying a piece of bailing wire to a balloon—it might keep it in place, but it isn't going to move around naturally. It's a good rule of thumb keep a good supply of Umpqua's Nylon Tippet spools on hand, so you can tie the right size tippet to the fly you're currently fishing for a more natural and effective presentation.