This fly tying chenille has long, loose translucent fibers that undulate in the water like marabou. The UV quality comes from long UV fibers that catch ultraviolet light and make the chenille iridescent. Adds bulk and a full-bodied look without adding significant weight to the fly. Great material for saltwater, trout, steelhead, salmon, and warm water patterns. 5 yards per package. Fibers are about 1" long.