Cotton batting gives quilts a flat, breathable traditional feel, polyester runs loftier and lighter, and wool delivers the most warmth at the lowest weight.
For the full breakdown, see our best Batting for Quilts by the Roll guide.
Pick the wrong batting and a finished quilt either washes into a clumpy mess or turns out too stiff and heavy to drape. The fiber underneath the quilt top controls breathability, loft, stitch definition, and how the whole thing survives the laundry — and cotton, polyester, and wool push those qualities in very different directions.
Here’s how each one behaves, what the official batting charts list for loft and shrinkage, and how to match a fiber to the quilt you’re actually making.
What Changes When You Swap Batting Fibers?
Loft, breathability, warmth, shrinkage, and durability all shift with the fiber, and those five traits drive every practical decision in a quilt.
Cotton is a natural fiber, breathable and soft with generous drape, usually at low loft though medium and high loft versions exist. Polyester is a manmade fiber that runs higher in loft and much lighter in weight, holds its shape better than either natural option, and typically has little to no shrinkage. Wool is natural, warm, lightweight, and breathable, with more loft than cotton and a drape that many quilters prefer for stitch definition.
Wool tends to be the most resilient natural batting for warmth and bounce, while cotton takes the softest, most traditional hand. Polyester brings the puff and the easy wash cycle. One caveat cuts across all three: brands and constructions differ, so loft and washability vary even within a single fiber family. The MFA Cameo batting chart is a useful reference for fiber-by-fiber comparisons.
How Much Do Cotton, Polyester, And Wool Batting Shrink?
Expected shrinkage varies by fiber: pure cotton can shrink around 3–5%, wool runs roughly 0–3%, polyester stays at 0–2%, and an 80/20 cotton-poly blend lands near 2–3%.
A shrink percentage tells you what the finished quilt does after its first wash. Cotton will wrinkle and crinkle — many quilters want exactly that soft, vintage rumple, but it means the quilt will finish slightly smaller than the top. Polyester barely moves. Wool sits in between and needs a gentler hand.
A cotton/poly blend, commonly 80% cotton and 20% polyester, splits the difference on purpose: more stable and less shrink-prone than pure cotton, more breathable than pure polyester. If you want the cotton look without a big surprise after the first tumble, the blend is the safer route. Hobbs Batting’s FAQ recommends a flatter texture with 100% cotton when that specific traditional hand is the goal.
The APQS quilting-density and batting reference is a helpful companion when matching batting choice to stitch spacing.
Which Batting Should You Actually Buy?
Match the fiber to the trait your quilt needs most, since no single batting wins on every measure.
- Cotton for breathability, a flatter hand, and the crinkled washed look. Best for heirloom and traditional quilts that want a lower profile.
- Polyester for loft, light weight, and wash durability. Best when you want a puffy quilt that survives repeated machine washing.
- Wool for warmth, resilience, and strong stitch definition, especially when low weight matters. Best for show quilts and cold-climate bed quilts.
- An 80/20 blend for a compromise between cotton’s feel and polyester’s stability.
If you’re still weighing brands and pre-cut rolls, our roundup of the best batting for quilts by the roll compares the tested options side by side.
The single biggest mistake is assuming all battings of one fiber behave the same. Loft, shrinkage, and washability shift by brand and construction, so check whether a batting is pre-shrunk or washable before you buy.
Quilting density matters too. Polyester is especially sensitive when there isn’t enough stitching to hold the fibers in place, and it can shift or “beard” — migrate fibers through the fabric. Wool needs gentle washing; agitation can make it felt, shrink, or bleed.
Polyester is also less breathable than cotton or wool, so a heavy poly quilt can sleep hotter. And never expect wool to behave like cotton in a hot wash — it won’t.
FAQs
Is wool batting warmer than cotton?
Yes. Wool is typically the warmest of the three natural-leaning options, and it delivers that warmth at a lighter weight than cotton. That combination is why wool is often chosen for cold-weather bed quilts and for quilts where warmth matters more than a flat, traditional profile.
Can polyester batting be machine washed?
Polyester usually handles repeated machine washing better than cotton or wool because it retains shape and shrinks very little. That durability is a real advantage for kids’ quilts and everyday throws. Just verify the specific batting is labeled washable, since construction varies by brand.
Which batting gives the flattest finished quilt?
Cotton batting gives the flattest, most traditional hand, which is why it suits heirloom quilts and vintage-look projects. It also wrinkles and crinkles over time, producing the soft rumpled texture many quilters want. Polyester and wool both finish loftier and puffier.
References & Sources
- MFA Cameo. “Batting” Fiber, loft, and shrinkage comparisons for cotton, 80/20 blend, polyester, and wool.
- Hobbs Batting. “FAQs for Quilters” Recommends a flatter texture with 100% cotton batting.
- APQS. “Batting Comparison Reference Chart” Loft, shrinkage, and quilting-density guidance across batting types.
