Flat-laying multifilament design: Ensures smooth tying and compatibility with split thread and dubbing loops
Waxed finish with slight twist: Holds wraps secure and cooperates with split thread techniques
Wide color range: Offers both subtle and vibrant options for fly patterns
High breaking strength: Supports flies up to 14 and 210 denier for various fishing conditions
Available in multiple denier options: Suitable for sizes 6 to 14 and larger flies
Summarized by Shop
Ultra Thread's slim, round, multifilament build lays flat instead of stacking bulk, so matching denier to the hook is what matters most: 70D for size 14 and smaller, 140D for sizes 6–14, and 210D for streamers and big saltwater flies. Specifications
Available In: 70, 140, and 210 denier, in a wide color range
Spool Length: 100 yards
C
Denier
140
Construction
Multifilament nylon, round cross section
Length
100 yards per spool
Color Options
Wide range (including natural, bright, and multicolor)
Pattern
Solid
Summarized by Shop
4.9
59 ratings
5
4
3
2
1
Best Thread for Me
D
Donald · August 20, 2026
I use this thread for all of my buggers and smaller flies.
J
Joe · 17 days ago
My favorite thread
I use 70 denier ultra thread for most of my tying. Small size does not bulk up flies and strong enough for most flies. Highly recommend this thread.