Polyyarn has been nicknamed by fly tyers world wide the 'floating yarn'. It is so fibrous and so beautifully buggy, this easy to use fly tying material, indeed Dry Fly Polyyarn is a must have fly tying material. Dry Fly Polyyarn is a bonded for of polyyarn 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.