"The Wulff flies were designed by Lee Wulff and fill a decided need in large sizes. I consider them necessary to the well-balanced fly box. New Wulff patterns, Black Wulff and Grizzly Wulff [designed by Dan Bailey] have been added to my color plates because they are considered very important by fishermen in the Rockies as well as other sections.   — Ray Bergman, Trout (1952")

I tie all of my Wulff patterns using a poly wing.  I believe that this helps with buoyancy of the fly and looks great.