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Semperfli Poly Yarn, who is a floating polypropoylene yarn, is ideal for posts, wings and bodies. Polypropylene or “poly” is a lighter-than-water polymer material available in spun fiber or yarn form. Semperfli Poly Yarn is excellent for dry fly bodies and wings, and particularly useful as spent wings in dry fly spinners. It can also be used for nymphs or as streamer wings if tied on heavier hooks. It is available in a wide variety of colors, textures and fiber thickness.
In the fly tying material market, Doug Swisher and Carl Richards made the first mention of poly fiber in their book entitled Selective Trout. They felt its specific gravity was extremely important for dry flies. It is a consideration that has been debated many times, and may or may not be true. We fully agree with them, no matter what others would say, but remember our words very well now: poly yarn tied on a hook has to be treated with a high quality floatant or the fly will sink easily when the poly catch water and the extra weight will pull a fly down rather quickly. Poly Yarn absorbs water extremely well so it also will absorbs a floatant real good what also easily makes it water resistant too.