I never heard of it either until I read a recent batting thread. In fact, there's two of them that should be on the first or second page in the main part...i'm just not sure which one it was.
It acts like a high loft batting and can be heavy even though its thin enough to be low loft. It's 50% bamboo and 50% cotton. The sales girl raved about it for hand quilting....I guess it's good for machine quilting too, but I don't do that often enough to have an opinion.
This will be the first time I'm using it...I'll post when the quilting is done.