1. YLI - Wonder Invisible Thread (nylon and a cross wound small cone)
2. Superior Threads - Mono-Poly Thread (polyester and a parallel wound spool)
Both come in "Smoke" - which is best for dark colors - and "Clear" - best for lighter colors.
These are both far superior to the invisible thread of years ago - when it first came out. They are much finer than that thread when it first debuted on the sewing scene in the early 80's, (which I will never forget, as I'd stitched up matching swim suits for my daughter and I and the first time we wore them was the last as that thread poked us mercilessly!)
I use these threads extensively in the needle with regular sewing thread in the bobbin for couching yarns, cords, etc. onto garments for embellishment. TEST - as I find that I MUST LOWER my UPPER THREAD TENSION so that I don't have specks of the bottom thread peaking to the top.
At times, I also want this thread in the bobbin - but be careful when doing this! Take great care that you wind the bobbin slowly, and NOT full - as especially with a plastic bobbin, you might not be able to get the bobbin off the spindle! Also be sure that your bobbin has the right tension on it - you must NOT be able to stick your fingernail easily into the thread on a bobbin - if you can, it is too loose in its tension - and will never sew properly. I find sewing with monofilament in the top and the bobbin is quite a challenge - and rarely do so. Just my experience...
Quilters also use this invisible thread and a hint I was given written by Sue Nickels for Machine Quilting suggests the following to manage the thread coming off the spool...
"Place the thread behind the machine and bring it up through an auxiliary guide. This guide could be a safety pin taped upside down to the back of the machine or an empty bobbin placed on the spool pin. Pull the thread through the holeof the auxiliary device. When using fine invisible thread, hyou may need to loosen the top tensionand make adjustments through the tension bars." When asked about the logevity of invisible thread in quilts, Sue says that some of hers are 15 years old and seem just fine. She adds that quilt museum curators are documenting quilts made with invisible thread, and, over time, will be able to tell us what happens. She adds, though, that if making an heirloom quilt destined to be handed down over generations, that you might want to steer clear of this thread that might outlast the cotton fibers of a quilt.