Power Pro begins with ultra-strong braided Spectra Fiber, which is treated to create an incredibly round, smooth and sensitive line. The development of Vermilion Red Power Pro is based largely on the color spectrum in water. Since shades of red are the first color to fade, it is thought that by using red colored line, the angler"s line will "disappear" underwater. Truth be told, red does not disappear but in fact turns to a shade of gray. This gray tone will help to blind the line in to the background and become much less visible to most fish that swim. The color red will fade out at a depth of approximately 14 feet. Therefore, when targeting fish in depths of 15 feet or greater, Vermilion Red is ideal. Whether you are deep cranking for bass, trolling for lake trout, walleye or salmon; to bottom fishing in deep rivers...Vermilion Red PowerPro should be on your reels.