These are two of the best imitations for adult caddis in my box. The Elk Hair Caddis is famous all over the world and works extremly well. The other pattern,Nelson Caddis, is not in that many fly boxes. In my time I have seen it only a few times in the boxes of other tyers. I use this one for the larger caddis and when river fishing. It floats very well and the fish love it. I have lots of good memories with fly…It deserves to be fished!