Rio Mainstream Series Trout Fly Line Lemon Green WF5F 80ft/24.4m While many RIO products focus on the technical challenges of specific fishing situations, Mainstream lines are targeted to the overall needs of most fly fishers looking for a cost efficient, one line solution. Featuring slightly shorter heads and tapers to ensure performance under almost any conditions. Floating lines feature a supple, self-lubricating coating that remains memory free in cold water. Choose from a range of densities or get the set to be sure you have the right line in your bag to succeed on the day. Made at the RIO factory in Idaho, Mainstream lines undergo the same rigorous production processes and quality control standards as all RIO products.