It's easy to make fly-line loops from braided mono or Dacron. This alternative is favored by many because of the resulting loops' slim profile and impressive strength. For splicing to small-diameter deep-sinking shooting heads like T-14 or LC-13 and fly lines of 9-weight or less, 30-pound-test braid works best; 50-pound-test works well for fly lines of 10-weight or larger. - Pete Barrett