Batting is the part of a quilt nobody sees and everybody feels, and it's also where I see new quilters make the most default, unexamined choices — grabbing whatever's cheapest or most familiar without thinking about what the finished quilt actually needs to do. The right batting depends entirely on the project, not on habit.
Cotton batting
Cotton is the traditional choice, and for good reason. It's breathable, which makes it comfortable for bed quilts used year-round, and it has that flat, close drape that reads as classically "quilted" rather than puffy. Cotton batting also tends to shrink slightly with its first wash, which contributes to the soft, slightly crinkled texture a lot of quilters specifically want.
The tradeoff is that cotton batting needs closer quilting lines to stay stable over the long term. Most cotton batting has a maximum recommended quilting distance — often somewhere around 4 to 8 inches between lines of stitching, depending on the brand — and skipping that guidance leads to the batting shifting, bunching, or clumping inside the quilt after repeated washing. If you're planning a quilt with large open background areas and minimal quilting, cotton is not the most forgiving choice.
Polyester batting
Polyester batting gives you a loftier, puffier look — the kind of dimensional, cloud-like quilt you see in a lot of modern quilt photography, where the quilting stitches sit on top of a noticeably raised surface. Because polyester fibers hold their shape and don't shift the way cotton does, poly batting doesn't require nearly as dense a quilting pattern to stay stable, which makes it a practical choice if you want to quilt with wide-open space between lines.
The tradeoff runs the other direction from cotton: polyester is less breathable, so a poly-batted quilt runs warmer and can feel a little stuffy for someone who runs hot at night. It's also more prone to a slight sheen or "beard" — fibers migrating slowly through the quilt top's weave over time — though this is much less of an issue with modern bonded polyester battings than it was with older, cheaper versions.
Wool batting
Wool is the one people underestimate until they've actually used it. It's remarkably warm for how lightweight it is — noticeably warmer than an equivalent thickness of cotton or poly — and it drapes beautifully, with a soft, almost liquid fold that neither cotton nor polyester quite matches. For a quilt meant to be draped over a couch or folded at the foot of a bed rather than laid perfectly flat, wool's drape is genuinely superior.
Wool costs more than cotton or polyester batting, often significantly more, and it needs more careful laundering — generally a gentle cycle or hand wash, laid flat to dry rather than machine dried, since heat and agitation can felt or shrink wool batting unpredictably. It's not the batting to reach for on a quilt that's going to get thrown in a hot dryer weekly.
Cotton-poly blends as a middle ground
Blended batting, usually somewhere around 80% cotton and 20% polyester, is a genuinely useful compromise rather than a lesser option. It picks up some of cotton's flatter drape and breathability while borrowing some of polyester's stability, which means blended batting typically tolerates wider quilting distances than pure cotton without shifting. For quilters who want a traditional look without the strict quilting-density requirements of pure cotton, a blend is often the most practical everyday choice, and it's what I reach for by default when a pattern doesn't have a strong reason to point me elsewhere.
Choosing based on what the quilt is actually for
The best way to choose batting is to start with the finished quilt's job, not with whatever's in your stash. A bed quilt meant for daily use and regular washing does well with cotton or a cotton-poly blend, since both hold up to frequent laundering and give that classic, flatter look people expect on a bed. A wall hanging that will never be washed and is judged purely on how it hangs can support a wider range of choices, including wool for its exceptional drape. A baby quilt, which will be washed often and needs to be lightweight and breathable, points toward cotton or a cotton-poly blend over wool or heavy polyester.
A summer quilt or a lightweight throw benefits from a thin cotton or blend batting, since bulk isn't the goal — you want something that adds structure and a bit of texture to the quilting without adding real warmth. A quilt made specifically to be warm for cold-weather use is where wool or a higher-loft polyester earns its keep, even accounting for the extra cost or care that comes with it.
Before reaching for whatever batting you always use, ask what this specific quilt needs to do — how it'll be washed, how warm it needs to be, whether drape or flatness matters more — and let that answer choose the batting instead of habit.
A note on loft and labeling
Batting packaging usually lists a loft measurement, which is essentially the thickness of the batting before it's compressed by quilting. Higher loft numbers mean a puffier finished quilt with more visible dimension around the quilting stitches, while lower loft gives a flatter, more traditional finish regardless of fiber type. Two battings of the same fiber can behave quite differently depending on loft, so when you're comparing options within the same category — say, two cotton battings from different brands — loft is often the more useful number to compare than the fiber content alone.