Uni-Thread by Uni 8/0 Fly Tying Material is by far the most popular thread for midge patterns. The continuous polyester filaments are bonded together in a compound twist. As a result, midge bodies with even a single layer of thread remain true to color, with no bleed-through when wet. Size: 200-yard spool. Great for midge patterns Compound twisted filaments No bleed-through when wet.