RIO " Gold " Trout Lines / THE ULTIMATE ALL-ROUND floating line for trout ! The RIO Gold has a revolutionary taper design that gives incredible loop stability at distance, a unique profile that allows a rod to load at close range and a front taper that delivers perfect presentation of flies between sizes #22 and #2. The RIO Gold is the ultimate all round , floating line for the trout fly fisher. NEW MaxCast and MaxFloat Tip technologies on the Gold Series.