cotton!

Normal cotton batting. No different from what I put in the quilts I make.
Linda

Leftovers! I put together the leftover strips with fusible interfacing or baste them by hand. Once your quilting is done no one will be able to tell.

I've also used Thermore which is very thin and also great for vests and other wearables.

And, I've used cheap flannel when I had it.

Cotton like Warm and Natural? Or just plain cotton batting?

Vic

I use different kinds. Mostly Hobbs heiloom 80-20 as that is what I use in my quilts. I like Thermore because it is easy to work with and thin. I do like Teresa and piece butting, zigzagging togeather. I have used low loft poly but that isn't my favorite but it comes in charcoal. Jayne

If you I put together leftovers, be sure to either stagger the eges with a wavy line cut, or trim both and overlap layers to make it imperceptible, join them carefully and baste the quilt carefully, especially through that area.
A friend of mine has a gorgeous hand appliqued Baltimore Album quilt, with trapunto feather vines and dense hand quilting, but when she holds it up, you can see a gap right down the center where the batting was joined. Heartbreaking, and it could have so easily been avoided.
BlueBars

So, BlueBars, you're saying that butting the edges and then joining is not enough? You have to overlap them a bit?

It could be enough, depending on the quilt. But instead of cutting a straight edge and joining the straight edges, overlap the batting by a few inches, and imagine a wavy line WITHIN that overlap. Cut both layers at a time in a wavy line. Don't move them. Remove the excess piece from above, and the excess piece from below. Then join them securely as they lay. Try it with 2 overlapped paper towels so you get the concept.
The batting in the finished quilt is much less likely to shift or gap, especially if the quilt would ever be folded along that joined edge inside. Top and backing seam lines as well as quilting lines are also less likely to cross that "join" in same way at any point (hope that makes sense).
BlueBars

Cotton batting sometimes,but most of the time Pellon fleece.
Kathi

Thanks for the extra info, BlueBars. I can imagine how to do the wavy splice, but didn't figure that the wavy join keeps the batting from getting damaged if a fold crushes the fibers at the join line. I'll have to remember that.