Tiny flies call for a thread that won't ruin the profile with unnecessary bulk, and UNI Caenis Thread is just the right stuff. This thread is measured at 20 denier, which is about 19/0-20/0, and comes in black or white. With its thin diameter, this thread can be used for the smallest flies in your box-from midges and tricos all the way down to tiny BWO, UNI Caenis gets it done. Uses UNI Caenis is used for tying the tiniest flies in your box. This thread is excellent for midges, small mayflies, tiny ants, and more, but it's also a common choice for those who want to tie full dress salmon flies, as it makes for a very smooth underbody. Comparisons Whenever it comes to ultra-thin threads, another good option is Danville's Spiderweb. Spiderweb is measured at 16/0, which is just a little heavier than UNI Caenis. Aside from diameter, another difference between the two is that UNI Caenis comes in a 200-yard spool, whereas Spiderweb comes in a 100-yard spool. No matter what you choose, both of these threads are a good choice for those flies size 20 and smaller.
