Lifelike movement, natural barring, and durable stretch for tying better flies.
MFC Barred Sexi-Floss from Montana Fly Company is a premium barred rubber leg fly tying material made from durable, UV-resistant spandex. Featuring a crinkly texture, excellent elasticity, and natural-looking black barring, this versatile material creates realistic legs, antennae, ribbing, and segmented bodies on a wide variety of freshwater and saltwater fly patterns.
Unlike traditional round rubber legs, Barred Sexi-Floss offers improved resistance to UV exposure and deterioration while delivering a flexible, lifelike wiggle in the water. The pre-applied speckled and grizzly-style markings eliminate the need to hand-bar legs with a permanent marker, making it easy to add natural contrast and movement to Rubber Legs flies, stonefly nymphs, hopper patterns, streamers, bass bugs, and saltwater flies.
MFC Barred Sexi-Floss is one of our favorite materials for adding movement and realistic detail to flies without adding unnecessary bulk. The stretchy spandex fibers have an excellent underwater wiggle, while the pre-barred finish gives stonefly legs, hopper legs, and streamer accents a more natural appearance. We especially like it for buggy legged trout nymphs, articulated streamers, and bass bugs where durability, flexibility, and movement are essential.
Natural Black Barring & Speckled Finish Machine-applied markings create realistic leg patterns and natural contrast without the extra work of coloring individual strands by hand.
Durable UV-Resistant Spandex Designed to resist the drying, cracking, and deterioration that can affect traditional rubber leg materials over time.
Excellent Stretch & Lifelike Movement The highly flexible, crinkly spandex fibers move naturally in the current, adding realistic swimming, kicking, and wiggling action.
Perfect for Legs, Antennae & Bodies Use for stonefly legs, hopper legs, streamer accents, antennae, ribbing, and segmented fly bodies.
Available in Small & Medium Two thickness options make it easy to match the leg size and profile to smaller nymphs or larger streamers and terrestrial patterns.
Versatile Color Selection Offered in a variety of natural and bright colors for everything from realistic trout flies to high-contrast attractor patterns.
MFC Barred Sexi-Floss is ideal for tying:
Stonefly nymphs
Girdle Bug patterns
Hopper flies
Beetle and terrestrial patterns
Bass poppers and divers
Articulated streamers
Sculpin and baitfish patterns
Steelhead flies
Salmon streamers
Crawfish imitations
Saltwater shrimp and crab patterns
Nymph legs and antennae
Segmented fly bodies and ribbing
Warmwater attractor flies
Small Barred Sexi-Floss Best for smaller stonefly nymphs, trout nymph legs, compact terrestrial patterns, smaller streamers, and flies requiring a finer, more subtle leg profile.
Medium Barred Sexi-Floss Ideal for larger rubber legs style flies, hopper patterns, bass bugs, streamers, crawfish imitations, and saltwater flies where thicker legs and more pronounced movement are desired.
Brand: Montana Fly Company (MFC)
Material: Crinkly spandex / spanflex-style synthetic
Style: Barred / speckled rubber leg material
Sizes: Small and Medium
Finish: Pre-applied black barring with grizzly-style markings
Key Properties: High stretch, UV resistance, flexible movement, and improved durability
Best For: Legs, antennae, ribbing, segmented bodies, streamers, stonefly nymphs, terrestrials, bass bugs, and saltwater flies
Control Leg Length & Proportions Cut the Sexi-Floss slightly longer than your desired finished leg length, then trim after tying. This makes it easier to keep legs balanced and evenly positioned on the hook.
Avoid Excessive Tension Although the spandex is extremely stretchy, pulling too tightly during tie-in can cause the legs to recoil or distort their final position. Secure them with controlled thread wraps while preserving their natural flexibility.
Use Multiple Strands for Larger Patterns For big stonefly nymphs, bass bugs, and articulated streamers, combine several strands to create fuller legs and more noticeable movement. Keep smaller trout patterns sparse for a more natural silhouette.
Create Segmented Bodies & Ribbing Wrap Sexi-Floss around the hook shank to build flexible segmented bodies or use it as ribbing over dubbing and other body materials. The barred markings add visual contrast while the stretchy fibers help create a clean, defined profile.
Combine with Natural Materials Pair Barred Sexi-Floss with chenille, dubbing, rubber legs, marabou, or synthetic streamer materials to create flies with contrasting textures and enhanced underwater movement.
MFC Barred Sexi-Floss is a durable, UV-resistant barred rubber leg fly tying material that combines natural-looking markings with excellent stretch and lifelike movement. Available in Small and Medium, it's an outstanding choice for tying Pat's Rubber Legs, stonefly nymphs, hopper flies, bass bugs, articulated streamers, steelhead patterns, and saltwater flies. For fly tyers looking for realistic barred legs, versatile spandex body material, and lasting performance, Barred Sexi-Floss is an essential addition to the tying bench.
