The thread is 100% cotton, very fine. It is excellent for appliqué and many other uses. The thread has one problem, and it is not uncommon for other 50 wt cotton threads, ...the end can tangle, causing a knot. I keep scissors handy and keep snipping off the tail every so often to keep thread moving smoothly along. You can also use thread wax...or “no static” spray. I love how it disappears for applique and is my favourite for hand piecing...enjoy! So glad DinkyDoo has it in stock..thank you!