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Does Quilt Batting Shrink? When (and How) to Prewash Batting
Updated September 2026 · By the ThreadWorks team
The short answer: yes, most cotton-containing battings shrink a little the first time a quilt is washed and dried. 100% cotton shrinks the most, 80/20 blends shrink less, and polyester barely shrinks at all. That shrinkage creates the soft, crinkled look many quilters love. Prewash batting only when you want a flat, modern finish or the quilt must stay exactly to size, and follow the manufacturer's care instructions when you do.
Which Battings Shrink, and by How Much?
| Batting fiber | Shrinkage tendency | What it does to the finished quilt |
|---|---|---|
| 100% cotton | Highest of the common battings | Noticeable crinkle; the traditional “antique” look |
| 80/20 cotton/polyester | Moderate | Light texture; quilting stays more defined |
| Bamboo and bamboo blends | Varies by product | Soft, drapey texture; check the label |
| Wool | Low when handled as directed | Lofty and resilient |
| 100% polyester | Minimal | Stays puffy and flat; little crinkle |
Each manufacturer publishes its own rating, and that is the number to trust. ThreadWorks Soft & Elegant 80/20 and ThreadWorks Simply Cotton are both rated at less than 5% shrinkage in the supplied product information.
What Shrinkage Means in Inches
A percentage is easier to plan around once you see it in inches. The table shows the maximum draw-in at common rates. Real results are usually below the maximum, and quilting density changes how shrinkage shows.
| Quilt side | 2% shrinkage | 3% shrinkage | 5% shrinkage |
|---|---|---|---|
| 40" (baby) | 0.8" | 1.2" | 2" |
| 60" (throw) | 1.2" | 1.8" | 3" |
| 90" (queen width) | 1.8" | 2.7" | 4.5" |
| 108" (king) | 2.2" | 3.2" | 5.4" |
On a bed quilt, a couple of inches is rarely noticed. On a wall quilt that has to fit a frame or a space, or a show quilt with a measured border, it matters.
Why Batting Shrinkage Isn't a Problem (Usually)
When cotton batting relaxes and draws in slightly in the wash, it pulls the fabric between quilting lines into gentle puckers. That is the soft, lived-in crinkle of a traditional quilt, and many quilters deliberately choose unwashed cotton batting to get it. As long as the fabric and batting shrink together, the quilt stays square and simply gets cozier.
Should You Prewash Quilt Batting?
| Prewash the batting if… | Don't prewash if… |
|---|---|
| You want a flat, crisp, modern finish with minimal crinkle | You want the traditional crinkled look |
| The quilt must stay an exact size (wall quilts, frames, shows) | It is a bed quilt or throw where a little draw-in is fine |
| You prewashed your fabrics and want everything to behave the same | You didn't prewash your fabrics (let them shrink together) |
| The manufacturer recommends it for your intended use | The manufacturer's instructions advise against it |
The fabric decision and the batting decision go together. If you prewash fabric but not batting, the batting will draw in on the first wash and pucker the prewashed fabric. That's lovely if you like crinkle, surprising if you don't. Our guide Should You Prewash Quilting Fabric? covers the fabric side.
How to Prewash Batting Safely
Loose batting is fragile until it is quilted. Agitation in a washer and tumbling in a dryer can pull it apart, twist it or felt it in patches. For ThreadWorks rolls, the supplied care information recommends hand pre-washing. Always follow the instructions that come with your batting.
- Cut first. Cut the piece you need (with your usual allowance) rather than washing a large length.
- Soak in cool water with a mild detergent in a clean tub or large basin.
- Let it soak about 15 minutes. Press gently to wet it through. Don't wring, twist or scrub.
- Drain and press out water with flat hands, then roll the batting inside a dry towel to absorb the excess.
- Dry flat on a clean, flat surface out of direct sun, turning once.
- Do not machine wash or machine dry loose batting before quilting.
Alternatives to Prewashing
- Relax it. Roll batting comes off flat, but packaged batts are folded. Unfold and let them rest flat overnight, or follow the maker's instructions for relaxing creases.
- Choose a lower-shrink batting. If you want minimal crinkle without prewashing, an 80/20 or a polyester-containing batt shrinks less than all-cotton.
- Quilt consistently. Even quilting density means even shrinkage, which keeps the quilt square.
- Make a test swatch. Quilt and wash a 10" square and measure it before and after. Two minutes of measuring beats guessing.
How to Keep a Quilt Square When It Shrinks
- Quilt with similar density across the whole quilt, including borders. Heavily quilted centers with lightly quilted borders cause wavy edges after washing.
- Stay within the batting's maximum quilting distance (up to 10" for ThreadWorks Soft & Elegant and Simply Cotton).
- Wash the finished quilt in cool water and dry on low, or lay flat to finish drying.
Frequently Asked Questions
Does 80/20 batting shrink?
A little, less than 100% cotton. ThreadWorks Soft & Elegant 80/20 is rated at less than 5% in the supplied product information.
Does 100% cotton batting shrink?
Yes. Cotton relaxes and draws in when washed. That's what creates the traditional crinkle. ThreadWorks Simply Cotton is rated at less than 5%.
Can I put batting in the washing machine?
Not loose batting before it is quilted, unless the manufacturer specifically says you can. Agitation can tear or distort it. Once quilted, the finished quilt can be machine washed according to its fabrics.
Does polyester batting shrink?
Very little. Polyester keeps its shape, which is why poly and poly-blend battings give flatter, crisper results after washing.
Will my quilt shrink if the fabric was prewashed?
If the batting is cotton or a cotton blend and wasn't prewashed, the batting can still draw in slightly on the first wash and add texture, even though the fabric won't shrink much.
Shop ThreadWorks Batting Rolls
- Soft & Elegant 80/20: less than 5% shrinkage, light texture
- Simply Cotton 100%: less than 5% shrinkage, classic crinkle
- Perfect Blend 6 oz. 80/20: more body and dimension
Made in the USA · Free shipping · Boxed for protection · All batting rolls