HI-SEAS 100% Fluorocarbon is made from the highest grade of pure polyvinylidene fluoride and extruded to exacting quality control standards. It matches the light refractivity of water making it virtually invisible. Supple and easy to cast, HI-SEAS 100% Fluorocarbon is an excellent specialty running line. Pro bass fishermen are using it for a variety of finesse techniques and in super clear lakes because it sinks faster than mono, is undetectable by fish, and remarkably tough. It's also ideal for use as invisible leaders - if you use braids or colored lines, adding a leader of HI-SEAS Fluorocarbon increases hits and provides extra security against chafe and abrasion