My reels are filled with 37kg braided gel-spun line, but I like to connect that to a 150m length of 100lb nylon monofilament line. The braid is helpful to give much more capacity on the reels, and its thin diameter helps reduce water drag when a big fish takes a lot of line. However, the mono is easier for knots and rigging, and is tougher for the majority of abrasion while fishing. The 150m top-shot of 100lb mono also provides a good shock absorber when the fish are close to the boat. In front of the mono top-shot, I add a 29ft leader of 300lb mono.
I join the braid to the 100lb mono top-shot with a small, but strong, torpedo swivel. Is it IGFA legal to use a swivel to connect the braid and monofilament?