I use 6 strands of good quality embroidery thread for tying my quilts. It doesn't "shed" like yarn can. (It's also easier to get through the needle!) Fleece should be tied pretty closely...about every 5 or 6 inches, because it stretches so much. I tie mine in the 5 patch pattern like a dice has on it. Start in the center!!! Smooth out to the sides as you go and don't forget to pin it first. Good luck on your first project! :thumbup: