Monofilament thread, often called clear or invisible thread, is used to
show off the quilting but not the thread. Most monofilament thread is made of
nylon, not polyester, and is the same substance used in fishing line.
MonoPoly is made of polyester, not nylon. The advantages of polyester monofilament
Polyester has a much higher heat resistence than nylon.
Polyester monofilament does not go brittle over time.
monofilament does not discolor or "yellow" over time.
Polyester is softer
and more pliable than nylon, meaning it will lie better on and in the fabric.