The fly fishing line determines where your fly fishing fly sits in the water and forms part of the movemnet of the cast of an artificial lure. Basic variations include floating lines, sinking lines and intermediates. Most are available in different styles including double tapered fly fishing lines, weight forward options and shooting heads. Even sinking lines vary wildly in the speed at which they sink to the correct depth for individual fisheries, conditions and types of fish. Choosing the correct option can seem difficult but with a little bit of knowledge the right fly fishing line can change your day.