Dry Fly Poly Yarn Blue DamselPoly Yarn has been nicknamed by fly tiers world wide the floating yarn It is so fibrous and so beautifully buggy this easy to use fly tying material indeed Dry Fly Poly Yarn is a must have fly tying material Dry Fly Poly Yarn is a bonded for of poly yarn which is a dubbing on a rope product from Semperfli Its tight fibrous bonding makes it ideal on dry flies Not only does it float naturally but its fibrous design traps air to help your fly float Dry Fly Poly Yarn is durable and the color choices including the single color or mottled options means there are many natural representations in this poly yarn range Dry Fly PolyYarn is easy to taper to a point by simply heating Being part of the dubbing on a rope range this makes it easy to use for beginners and experienced tiers alike With a very specific gravity density of 0 91g cm3 polypropylene yarn including Dry Fly Poly Yarn is lighter than water which means that it floats making it ideal for dry flies 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 surface Indeed leave it for a day and it should still be floating as it is lighter than water and it is this property which makes it very very special for dry flies There are a few fly tying poly yarns on the market today from different companies Indeed Semperfli makes two versions of poly yarn the original Semperfli Poly Yarn that comes on cards and is ideal for most commonly used as parachute posts and dubbing wings and Dry Fly Poly Yarn is a spool based product which is intended for bodies of flies or to create detached bodies