SCIENTIFIC ANGLERS Frequency Boost Floating Fly Line – An excellent general-purpose line for freshwater situations, the Boost is built a half-size heavy and delivers a more powerful cast than the Trout taper. Designed for larger, heavier flies, the Boost offers superb performance in the wind and turns over giant hoppers, nymph rigs, and jointed streamers with ease. Color is Willow. SIZES: WF4F thru WF6F.