A longtime staple in the fly tying world, UTC Ultra 70 Denier Thread is considered a do-it-all thread for fly tying. It lays flat on the hook, giving tiers more control over thread buildup. It’s strong enough to tie everything from a size 12 elk hair caddis, and thin enough to dress a size 20 Griffiths gnat. If tiers had to have one spool of thread on their bobbin, they’d likely go with UTC Ultra in black. Available in a wide range of colors, this thread is an invaluable tool in your fly tying arsenal. It has proven its worth over time, to the point where UTC is stocked in virtually every fly shop in the country. The 70 denier thread is the same size as 6/0 Danville – another longtime staple – and comes in 100 yard spools. That’s more than enough to tie dozens of flies.