High on my list of threads for hot spots, collars, and everything in-between. I use this thread in conjunction with its cousin Nano Silk for every nymph and dry I tie.

Here is what Semperfli has to say “Classic Waxed Thread 18/0 is part of the Semperfli 18/0 30 denier range of Classic Waxed Threads (CWT) which have been designed specifically for fly tying for midges and all micro flies. Classic Waxed Thread 18 usually used on hook sizes 14 to 32. Classic Waxed Thread 18/0 threads are unique; laying flat with a two core construction but can easily be split to create dubbing loops and they are strong threads. We worked with our Pro Team to get the correct amount of wax on each thread to hold materials but not clog your bobbin holder”