In recent years there has been a craze among fisherman to use Red line. But Why? The logic behind this trend 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 disappear underwater. Truth be told, Red does not disappear but in fact turn to a shade of Gray. This gray tone will help to blend the line in to the background and become much less visible to most fish that swim. The color red will completely fade out at a depth of 14 feet. Therefore, when targeting fish in depths of 20 feet or greater, Red Line is ideal. Whether you are deep cranking for bass; trolling for lake trout, walleye or salmon; to bottom fishing in deep rivers...Red PowerPro should be on your reel.