Polar Flash is made out syntetic fibre and big Angel Hair. When its in the water it gets soft, and transparent. Its very strong. Perfect for Pikeflies and Baitfish. And also we use it as a underwing in our Tanukiflies, its lifting the wing perfectly. But it can be used in many ways and you can trim it as you like. Since Polar Flash does not absorb water, you can tie big flies that are easy to throw.