Semperfli Nano Silk 100D Saltwater Fly Tying Thread

Discover the ultra-strong, ultra-reliable GSP fly tying thread designed specifically for saltwater and big predator patterns. Famous for its incredible strength-to-diameter performance, this 100D variant features deeper, dope-dyed fibers—colored at the raw material stage during extrusion—so the shade is locked in for life. That means no lightening, no color run, and total confidence at the vise and on the water.

Built for durability and control, this thread offers a naturally flat profile that lays beautifully for smooth heads, tidy bodies, and precise ribbing. It’s ideal for streamers, chironomids, traditional flies, and robust saltwater patterns where holding power matters. Finer than many common 6/0 polyester options yet vastly stronger than polyester or rayon, it resists breaking under pressure but can be fully flattened for clean, low-bulk wraps and neat finishes.

Key benefits:

• Dope-dyed GSP formula with deep, permanent coloration
• Exceptional strength per denier for secure hook holds and tough materials
• Flat profile for smooth, low-build bodies and controlled tension
• Perfect for saltwater, streamer, and predator flies, plus chironomids and ribs
• Confidence-inspiring performance that won’t fray or fail easily

If you demand a saltwater-ready tying thread that blends maximum strength, minimal bulk, and colorfast reliability, this is a standout choice. Tie tighter, build cleaner, and fish harder with a next-generation GSP that sets the standard for modern fly tying.