I just started to use KK Tripolymer line. "Fish simply won’t see TriPolymer underwater"
"The advanced monofilament starts with a soft and supple Nylon 6 core, then high-tenacity Nylon 6,6 is introduced to add strength to the line. Finally, Nylon 12, the most durable nylon, is added to the TriPolymer Advanced Monofilament to give it an amazing abrasion-resisting performance. All this combined makes for a soft and supple line that can handle the toughest fishing conditions.
This new monofilament is incredibly smooth, so reduced friction in the rod guides along with having lower memory for better casting distance and fewer issues with line twists and backlashes. Line stretch is not a big concern with the line as well. The stretch factor is approximately 30% lower than traditional monos, so expect higher sensitivity and better hook sets when fishing it. The last thing about TriPolymer Advanced Monofilament is its higher specific gravity than other monofilament lines, a specific gravity of 1.21 lets the line sink in water, letting lures and baits sink through the water column even faster."