I've used double batting lots of times- I have one customer who often wants a wool batting along with a cotton batting- the quilting shows up beautifully with wonderful definition when using double battings. did you have questions-beyond, has any one done it? I can not remember who it is---but one of the 'Big, Nationally known quilters has been using double battings for years- I first heard about it & tried it about 10 years ago