Poly-Yarn (Polypropylene Floating Yarn)
Nicknamed by fly tyers world wide the 'floating yarn'. With a very specific gravity / density of 0.91g/cm3 Polypropylene Yarn is lighter than water which means that it floats making it ideal for dry flies, most commonly used as Parachute posts, and Dubbing.
Many companies claim to use Polypropylene Yarn however a simple test you can do at home to check if it is genuine Polypropylene Yarn is to cut a 1 inch / 25mm strip, scrunch it up in your fingers and drop it into a glass of water. If it is genuine Polypropylene Yarn then it should dip below the surface and then return to the waters surface film.
