The selection of appropriate braided line for use as a backing material on a spinning reel involves considering its strength, diameter, and compatibility with the primary fishing line. Backing serves to fill the spool, preventing slippage of the main line and providing additional line capacity for longer casts or when fighting larger fish. As an example, a 20-pound test braided line may be chosen as backing for a reel that will primarily use 8-pound test monofilament as its main line.
Utilizing braided line as backing offers several advantages, including minimal stretch, high strength-to-diameter ratio, and resistance to degradation. This approach ensures a solid base for the main line, reducing the risk of the main line spinning on the spool under pressure. Historically, monofilament was commonly used for backing; however, braided lines have gained popularity due to their superior performance characteristics in demanding fishing situations.