Hi Ninnie! I use YLI 100 percent cotton 60 wt for piecing and for quilting Superior Threads, either Masterpiece which is 50 wt or King Tut if I want it to be more prominent, which is 40 wt so a bit thicker and comes in delicious colours, either plain or variegated. I like the Superior Threads because they're not at all linty, although they are a bit more expensive, I think they're worth it. :-D