SLF Pro Wing is a new blended winging material made of 4-long, synthetic living fibers (SLF). The Pro in Pro Wing stands for profile. The goal when creating SLF Pro Wing was to produce a unique winging material with enough body to flare at the head of a streamer yet taper naturally at the tail, just like a natural baitfish. The flash fibers in the blend imitate the natural appearance of baitfish.SLF Pro Wing is excellent for tying streamers of any type and size. Try it on your favorite fly patterns or for creating new ones.