I use the Superior Threads invisible thread often, it is my. ' go- to' choice anytime I need to use invisible. I use cotton or cotton/poly blend in the bobbin. It works great with my machine and has held up well in the projects I've used it for. I will say though- I've not used it on a quilt that might be laundered daily/weekly. So, I don't know if that could change things. I love the thread though. I would contact/visit Superior Threads and ask questions there. It has held up well on projects that are used a lot- just no experience with frequently laundered. I would assume though if it is washed gently and laid flat or tumble dried with low heat it would be fine... Just my guess. I do love it, so I would try it.