These Quigley-style emergers feature a foam thorax, allowing the shuck and abdomen to ride in or just below the film, while the thorax, hackle, and wing remain above.  Isn't this what we want from all of our emgers?  These are great for all stream types, from low gradient spring creeks to high gradient freestone streams.  Available from Snake River Angler (www.snakeriverangler.com) and Montana Fly Company (www.montanafly.com) in sizes #12 to #16.