Hareline McFly Foam – Strong, Colorfast Filament for Fly Tying

Meet McFly Foam: Strong, Stretchy Filament for Flies

Designed for fly tyers who value performance and control, Hareline McFly Foam is a strong, stretchy continuous filament yarn that ties cleanly and holds up under handling. The filament is dyed with colorfast dyes, helping keep your patterns vibrant even after repeated wrapping and trimming.

Why it shines in real-world tying

• A robust, flexible filament that resists breakage during dense wraps and tight turns.
• Colorfast dyes prevent fading as you work through eggs, nymphs, and sculpted forms.

What you can do with McFly Foam

• Egg patterns: the strong filament stays secure while you form smooth, natural-looking eggs.
• Sculpted flies: build features like sculpins and woolheads with consistent texture and silhouette.
• Clean trims: the easy-to-tie, easy-to-cut nature makes trimming precise without fraying.

Performance you can feel

You'll notice the filament's stretch and strength in hand, helping you shape flies with confidence. The colorfast finish reduces the need for constant dye checks, so you can focus on the craft rather than color touch-ups.

Practical tips for best results

• Keep tension steady and use appropriate thread to secure the filament in place.
• Trim carefully for crisp edges when forming eggs or sculpted heads.

In practice, many tyers reach for McFly Foam when they want one versatile tool that travels from eggs to lifelike heads. The yarn's smooth surface glides easily over threads and materials, reducing friction and allowing cleaner wraps. Drying times are typical for standard foam filaments, letting you move on to finishing steps without delay. The colorfast finish means your first wrap's color won't fade into the next step, helping you keep your pattern consistent session after session.

Extra versatility

• Versatile for a range of patterns beyond eggs and sculpted heads, including subtle ribbing and body shaping.
• Colorfast dyes stay vibrant under shop and field lighting conditions.