Sunline Siglon F Fluorescent Monofilament Line provides optimum performance due to a unique process that fills the spaces between the nylon molecules with resin. As a result, Siglon F is moisture-proof, curl free, durable, and shock-resistant, making it the ideal fishing line. A special technique also prevents the fluorescent color of the line from fading, and also allows it to be unaffected by ultraviolet rays.