Seaguar InvizX is a best-selling fluorocarbon mainline engineered to provide extremely low memory which makes it soft, supple and more castable. It s soft & strong with exceptional sensitivity, low memory, virtually no stretch, fast sinking and superior knot strength for unmatched performance in most any conditions. Ideal for freshwater multi-species fishing applications fish can t see it and it s very soft and sensitive. Easy to manage on a reel.