Since most of the fly is a foam cylinder that sits at an angle of tail down in the water with the fly-lipp almost flat on the water or just under it, it's like a big deer hair bass bug. When Doug was developing the original fly he tried lots of different fly tying materials so it wasn't too tail heavy nor too top heavy so it would sit in the water on a very good angle. Here's a link to the flies http://www.lippedpopper.com/