McFlyfoam Fly Tying Yarn is a polypropylene-based yarn. It comes in a wide variety of colors and has numerous uses. When not treated with a floatant, the yarn will absorb water and sink quickly.

Uses

Patterns and Tying Techniques – McFlyfoam can be used for indicators and para-posts on flies when treated with a floatant. It can also be used to create egg patterns and for crab flies. It serves as a substitute anytime yarn or wool is required.

Comparisons

McFlyfoam vs Hareline Polypropylene Floating Yarn – Both products are made of similar materials. McFlyfoam will sink when not treated and is available in more colors.

Example Flies

Patterns – McFlyfoam is most frequently used for egg patterns like the Glo Bug. It can also be used for parachute posts on dry flies like the Adams. The McCrab Fly is a saltwater crab pattern tied using McFlyfoam.

Pack Size and Physical Description

Approximate Dimensions – Individual fibers are roughly 6 inches in length.

Pack Size – The pack is 6×3 inches and about a half-inch thick.

**These sizes and dimensions may vary based on manufacturer changes**