Fulling Mill Pro Thread Flat

Pro Thread Flat Pro Thread Flat is a high-performance fly tying thread designed to give clean, controlled wraps across a wide range of patterns. Its flat, untwisted construction allows the thread to spread smoothly on the hook shank, reducing bulk while increasing surface contact for better material control. Available in two denier options, Pro Thread Flat adapts to everything from technical trout flies to large, material-heavy patterns without sacrificing finish or strength. Performance Flat profile minimizes bulk while maximizing grip Smooth, even wraps for clean heads and consistent tension Excellent binding strength across both denier options Why We Use It We use the 70 denier for small trout nymphs, dries, emergers, and wet flies where slim profiles and precise control matter most. It lays flat, keeps heads clean, and secures fine materials without overpowering the fly. We step up to the 210 denier for streamers, saltwater patterns, and hair-wing flies where strength is critical. It grips hard, handles heavy materials, and lets us apply serious pressure with confidence. Materials Flat, untwisted synthetic fly tying thread Specifications Denier options: 70, 210 Profile: Flat Spool: Single spool Application: Trout flies, streamers, saltwater patterns Key Features Flat, untwisted construction for low-bulk wraps Two denier options to match fly size and materials Excellent material grip and thread control Suitable for everything from delicate trout flies to heavy saltwater patterns