I use EP Fibers in the vast majority of my saltwater flies. From EP patterns to Clousers, you cannot beat their durability. A typical Clouser tied with bucktail, will not last but a few fish before the material is destroyed, where the EP fibers, will require at most a combing. Another big advantage to them is the choice of colors. There are a lot of imitation fibers out there now, but none beat the original EP Fiber.