This exceptional leader and tippet material is made from 100% fluorocarbon (PVDF) this is not a nylon. The refractory index of Fluoroflex in water compared to nylon makes it almost invisible to fish. Fluoroflex sinks quicker than nylon for nymphs and wet flies and gets below the surface tension for dry fly fishing. Highly abrasion-resistant and impervious to ultraviolet light, fluorocarbon is slightly stiffer than Powerflex tippet material and will deliver the fly even in a heavy wind. The best use of Fluoroflex is for saltwater, clear freshwater lakes, and leader-shy freshwater or saltwater fish.