the invisible thread from Superior Threads is a very nice (problem free) thread- I generally use aurifil or cotton 60wt thread in my bobbin- in a neutral shade. when you visit Superior Threads you can print charts that tell you all about the different threads, what needles to use with what threads...lots of great free information. I use 'smoke' invisible for dark fabrics and clear for light fabrics and can even quilt with it without problem.