Meet the S.A. Frequency Boost from Scientific Anglers—the half-size heavy floating fly line designed to elevate every cast and expand your freshwater toolkit. Built into the renowned Frequency family, Boost delivers extra power where you need it most—streamers, larger dries, and heftier nymph rigs—without sacrificing the versatility you rely on for a wide range of conditions.

Key advantages

• Half-size heavy taper provides decisive turnover for bigger flies, allowing you to punch through wind and reach tight targets with fewer false casts.
• Mid-length head blends distance with control, so you can load quickly and place accurate presentations across a variety of runs and pockets.
• AST coated finish reduces friction for smoother casts and longer float life, even in variable climates.
• Braided multifilament core offers responsive feel and stability, helping you detect subtle takes and maintain line control when the water runs fast.
• Stream-line loop design for easy rigging and fast, reliable connections to your leader and tippet setups.
• General-purpose versatility made to load quickly and deliver the biggest flies, yet still perform across a broad range of freshwater applications.
• Willow color keeps the line visually distinct in choppy water, aiding accurate mends and casts from overhanging brush or brushy banks.

What it does for your fishing day

Whether you’re chasing resident browns in a windy canyon, throwing heavy nymph rigs beneath a canopy, or coaxing cruising trout with bulky streamers, the Frequency Boost gives you dependable turnover and power without compromising line control. It loads fast, so you can shorten your repertoire of false casts and spend more time fishing. The mid-length head helps you adapt from long casts to precise presentations as the water narrows or widens, keeping your casts efficient from the moment you wade in.

Ideal use scenarios

• Streamer-heavy setups where bigger flies demand extra distance and turnover
• Windy days when you need improved loading and quicker line recovery
• Moderate climates where a robust, durable floating line can handle a variety of flies and tactics
• General freshwater fishing—from rivers to still-water margins—without switching lines

Technical specs at a glance

• WF5F, WF6F, WF7F, WF8F (Willow color)
• 36.0 ft (WF5F, WF6F); 40.0 ft (WF7F, WF8F)
• Total length: 85.0 ft
• Grain weight (first 30 ft): 150 gr (WF5F), 175 gr (WF6F), 200 gr (WF7F), 225 gr (WF8F)
• Core: Braided multifilament
• Coating: AST
• Special features: Stream line loop, half-size heavy taper, optimized for freshwater use

Scientific Anglers’ Frequency Boost is a purpose-built choice for anglers who want more power when needed without sacrificing the delicate touch that makes a great presentation. It sits squarely in the mid-range of control and load, designed to handle a broad spectrum of freshwater fishing scenarios with confidence and consistency.