I just returned from a glorious week in the Missoula area and fished many of the local waters. The hot fly, particularly on the Blackfoot, was called the Purple Haze. We purchased it as a #12 and it was an Adams type parachute tie, with an elk hair tail, calf tail post and mixed grizzly/badger hackle. The body, however, was some kind of purple floss substitute that was great. I also saw several other attractors using the same material in different colors. Can anyone identify what this material might be?