The new top-tier EX Fluoro Ocea Leader fishing line from Shimano offers many advantages to demanding anglers who fish under challenging conditions. It is an extremely abrasion-resistant line, does not absorb water, allowing it to sink faster, has a clear color, and its refractive index is very close to that of water, making it less visible to fish. The structure of the Ocea Leader is quite different, as it has a soft Fluoro core for knot strength, a hard outer coating for abrasion resistance, and then a Fluoro coating over that to provide a smooth and soft surface.