Hareline McFlyfoam 

McFlyfoam is what happens when someone finally figured out how to make egg flies that actually look like eggs instead of sad little yarn balls. This strong, stretchy continuous filament yarn creates perfectly round, translucent egg patterns that make steelhead and salmon forget they're supposed to be selective.

Why It's Different

Unlike regular yarn that just sits there looking fuzzy, McFlyfoam is a continuous filament that stretches and compresses into realistic egg shapes. The material has a subtle translucency that mimics real salmon eggs, and it's strong enough to survive multiple fish without turning into a ratty mess. When you wrap it and compress it, it creates that perfect spherical shape that screams "I'm a delicious protein bomb" to every fish in the river.

Perfect For Tying

• Egg Patterns: The classic application—Glo Bugs, Sucker Spawn, and every egg variation you can imagine
• Egg-Sucking Leeches: That little ball of temptation at the head of your streamer
• Steelhead Flies: Egg patterns that swing through runs and hold in seams
• Salmon Flies: Spawn imitations that trigger aggressive strikes
• Trout Nymphs: Egg heads on nymphs for extra attraction
• Indicator Flies: Highly visible heads that double as strike indicators

Tying Tips

The key to perfect eggs is in the compression. Wrap McFlyfoam around the hook shank, tie it off, then trim it into a ball shape. The more you compress it while wrapping, the denser and more durable your egg will be. Less compression gives you a fluffier, more translucent look.

Pro move: Mix colors by wrapping multiple shades together for variegated eggs that look like the real thing.

Available in every egg color from natural to "fish have never seen this but they can't resist it."