SINKING LINE: RIO Premier Fathom is a complete series of sinking lines designed for easy distance and complete fly control, with ultra-slick performance. It was designed for easy distance and complete fly control for the lake angler. FEATURES: Each line has a short, quick-loading head for minimizing the number of false casts, and for quick, easy distance, and a color contrast between the head and the running line to easily show the line's loading point. INCREASED CONTROL: In addition, each line is built with a Hang Marker that shows anglers when to stop stripping, and when to fish the hang, and features RIO's Density Compensation (except type 7) for complete control. FRESHWATER FLY LINES: We have a fantastic selection of the highest quality freshwater fly lines, designed to optimize your time on the water. All of our freshwater fly lines are designed to excel at required casting and fishing needs and feature cutting-edge technology for maximum versatility and performance. Make the cast of your dreams with RIO's freshwater fly lines. PASSION & INNOVATION: For more than 20 years, RIO has demonstrated passion, innovation and a pure love for the sport through its development of the industry's highest performance fly lines. And the great news is, we will continue to research, design and refine our products to ensure they are your preferred line of choice for years to come. RIO's Fathom lines are a series of sinking lines designed specifically for the lake angler. Each line has a short, quick-loading head for minimizing the number of false casts, and for quick, easy distance, and a color contrast between the head and the running line to easily show the line's loading point. In addition, each line is built with a Hang Marker that shows anglers when to stop stripping, and when to fish the hang, and features RIO's Density Compensation (except type 7) for complete control.