You washed it in cold water, the way everyone says to, and your favorite shirt still came out of the dryer a size smaller. That is not bad luck. Cold water was never the main thing standing between your clothes and shrinkage.
We went back to what textile research and a laundry scientist actually say causes shrinkage, and the answer is less about the water temperature and more about two things most guides skip: how much the load gets tumbled, and how dry you let it get. Below is the method that follows from that, how to read the care label, what to do for cotton, knits and wool, and the four things that make it easier.
Written by Lara Yehia. Lara researches home and kitchen products for Cupindy.
How we researched this: we read published textile research on tumble drying, the FTC's official definitions of care label terms, guidance from Woolmark on wool, and a P&G laundry scientist's explanation of shrinkage. For products we read the Amazon listings and review summaries as they appear to a US shopper. We did not lab-test fabrics. Where the evidence is thin, we say so.
Published: August 31, 2025 · Last reviewed: September 2026
The short version
- Does cold water shrink clothes? It can. Cold water helps a little and is kinder to colors, but it does not stop shrinkage on its own. Water soaking into cotton and the tumbling of the machine do most of the work, whatever the temperature.
- The dryer is where it gets locked in. Drying cotton until it is bone dry is what sets the shrinkage. Take clothes out while they are still slightly damp and let them finish on a rack.
- Cut the tumbling. Use the gentle or delicate cycle, do not overload the drum, and put knits in a mesh bag.
- Wool is different. It felts when it is wet and agitated, and that is mostly permanent. Hand wash or use a wool cycle unless the label says machine washable.
- Read the label. "Tumble dry" with no temperature means the maker allows hot. "Tumble dry low", "dry flat" and "line dry" are there for a reason.
What you will need
Nothing on this list is essential, but each one makes a step below easier. We explain why in the section where each one comes up.
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Why clothes shrink in the wash
Most guides blame heat. The fuller picture has three parts, and which one matters depends on the fabric.
- Cotton, linen and rayon relax back. When yarn is spun, woven or knitted, the fibers are pulled under tension. Cotton loves water: it soaks it up and swells, and while it is wet and being tumbled, the fibers are free to relax back toward a shorter, tighter shape. Textile scientists call this relaxation shrinkage, and it is why a new cotton tee shrinks most in its first few washes.
- Wool felts. Wool fibers are covered in tiny scales. Woolmark explains that with moisture and heat the scales lift, and with agitation they lock onto each other in a ratchet-like way. The fabric gets thicker and smaller, and it does not go back.
- Synthetics mostly hold their size. Polyester and nylon absorb very little water, so they do not swell and relax the way cotton does. High heat can still distort them, and stretch fibers such as spandex lose their spring if they are dried hot.
The part that surprises people is how small a role the water temperature plays. Sammy Wang, a laundry scientist at P&G, told Martha Stewart that "the water temperature is not a huge factor in shrinkage," and that shrinkage is typically caused by the water itself and the agitation in the washer. The step that decides how much of it you keep, in his words, is "the level of dryness that you achieve" in the dryer. (source)
Does cold water shrink clothes?
Yes, it can, and that is why so many people are confused. Cold water helps, and it is the right default for most loads because it is gentler on colors and dyes. But if a cotton shirt goes through a long, full, fast cycle and then tumbles until it is bone dry, it will shrink even if the water was cold the whole time.
Here is what each setting means on a US care label, using the FTC's own definitions, and what it does for shrinkage.
| Label says | Water temperature (FTC) | What it means for shrinkage |
|---|---|---|
| Cold | Up to 86°F (30°C) | The safest choice. It does not stop shrinkage caused by tumbling and over-drying, but it avoids the extra help heat gives it. |
| Warm | 87 to 111°F (31 to 44°C) | Fine for most cotton that has been washed a few times. Not for wool unless the label allows it. |
| Hot | 112 to 145°F (45 to 63°C) | Use it when the label allows it and the load needs it, such as towels and sheets. Expect more shrinkage on new cotton. |
Can you wash clothes in hot water without shrinking them?
For things built for it, mostly yes. Towels, cotton sheets and whites are often labeled for hot water. Wash them on hot if you need to, then control the part that locks shrinkage in: take them out of the dryer while there is still a little dampness in the thickest seams, or finish them on a rack. For anything new, knitted or labeled cold or warm, follow the label.
Does the dryer shrink clothes more than the washer?
The washer starts it and the dryer finishes it. A 2003 study of knitted and woven cotton in the Journal of the Textile Institute found that the "temperature setting in the tumble dryer had no effect on shrinkage". Low heat is still kinder to fabric in other ways, but it is not the protection most people think it is. How dry the load gets, and how long it tumbles, matter more. (source)
How to wash clothes without shrinking them
Every step below either cuts the tumbling or keeps you in control of the drying.
- Check the care label first. It tells you the maximum the maker allows. The table further down this page decodes the symbols.
- Sort by fabric and weight, not just color. Heavy jeans and towels rub against light knits in the drum. Washing like with like means less friction and lets you pick the right cycle for each load.
- Choose the gentle or delicate cycle for cotton knits, tees and anything you care about. The FTC defines that cycle as "slow agitation and reduced time", which is exactly the thing that drives relaxation shrinkage.
- Do not overload the machine. A crammed drum does not tumble less; it rubs more. Leave room for the load to move.
- Turn knits inside out and bag them. A mesh bag stops tees, knits and leggings twisting around heavier items.
- Use cold or warm water, whichever the label allows. Cold is the default. It helps colors last, even though it is not the main defence against shrinking.
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Less rubbing in the drum
2 XX-large honeycomb mesh laundry bags, 24 x 24 inches
Most mesh bags on Amazon are sized for bras and socks. These are 24 by 24 inches, big enough for a couple of shirts, a hoodie or a pair of sweatpants, which are the clothes people most often ask about shrinking. The listing describes a honeycomb polyester mesh and an auto-lock zipper with a cover so it does not catch on the drum.
They are rated 4.6 stars on around 4,000 ratings, and Amazon's review summary says owners find them spacious and well made. Keep each bag about two thirds full, as the listing suggests, so the clothes inside can still move and rinse.
The honest trade: Amazon's review summary says the zipper is the weak point: some owners say it is strong, others report it breaking. If you only need bags for socks and underwear, the best-selling Muchfun honeycomb set is cheaper and smaller.
Check price on AmazonWool, knits and delicates
Wool needs the least agitation of anything in your closet, because agitation is what felts it. Hand wash it in cool water, or use your machine's wool or hand-wash cycle only if the label says machine washable. Machine-washable wool has usually been treated to smooth or coat the scales, which is why it survives a machine at all. Press the water out gently; do not wring it.
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For hand washing and delicates
Woolite Delicates liquid laundry detergent, 16 oz
A small bottle of gentle wash made for wool, silk and hand washing. The listing says it contains no bleach, phosphates or enzymes, and that it works for both hand washing and machine washing in any temperature. It is one of the best-selling delicates detergents on Amazon, rated 4.7 stars on nearly 8,000 ratings.
Amazon's review summary says owners like it for hand washables and cold-water delicates and find it gentle on fabric and skin.
The honest trade: The listing claims it prevents shrinking. We could not find evidence that any detergent does; what prevents it is the gentle handling and careful drying on this page. The review summary also mentions the bottle leaking down the side. It is scented; if you want unscented, Eucalan's no-rinse delicate wash is a well-rated alternative. For everyday loads, see our non-toxic laundry detergent guide.
Check price on AmazonHow to dry clothes without shrinking them
This is the step that decides whether the shrinkage stays. The goal is simple: do not let cotton tumble until it is bone dry.
- Air-dry what you can. Line drying means hanging damp clothes on a line or bar. For shirts, jeans and sweatpants, a rack indoors does the same job.
- If you use the dryer, stop early. Run a shorter cycle, or a "less dry" setting if your dryer has one, then take clothes out while they still feel faintly damp and let them finish on a rack or a hanger.
- Take clothes out promptly. Leaving a hot load sitting in the drum sets wrinkles.
- Dry knits and wool flat. "Dry flat" on a label means lay the garment out horizontally. Hanging a wet sweater stretches it in one direction while it shrinks in another. Lay it on a towel on top of the rack and ease it back into shape.
- Keep stretch fabrics away from high heat. Leggings and anything with spandex keep their spring longer when they are air-dried.
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Our first choice for drying
Amazon Basics foldable metal clothes drying rack
The simplest way to follow the advice on this page: an accordion-style steel rack with a chrome finish that folds flat for storage. The listing gives it a 32-pound limit, enough for a load of shirts and sweatpants.
It is the best-selling drying rack we found by a distance, with more than 71,000 ratings at 4.7 stars and more than 10,000 bought in the past month when we checked.
The honest trade: Amazon's review summary says durability and stability are mixed: most owners are happy, but some report it wobbling or breaking within months. It is also not big enough for a full family load. If you dry everything on a rack, the larger SONGMICS two-level gullwing rack holds far more, but it takes up more floor space and costs more.
Check price on AmazonIf you still use the dryer
Wool dryer balls will not stop shrinkage, and we would not buy them for that. What they do is bounce around the drum and separate the load, which helps air move. The brand claims up to 25% faster drying, and Amazon's review summary says many owners notice shorter drying times. A shorter cycle is only useful here if you still take the clothes out while they are slightly damp.
Wondering whether to keep dryer sheets at all? Our wool dryer balls vs dryer sheets guide covers what sheets leave on fabric and what the safety research shows.
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A shorter dryer cycle
Handy Laundry wool dryer balls, 6-pack
Six extra-large balls of New Zealand wool, used in place of dryer sheets. The listing says they last for more than a thousand loads. It is the best-selling set we found, with close to 96,000 ratings at 4.6 stars.
Owners in Amazon's review summary mention shorter drying times, fewer wrinkles and softer clothes without fabric softener.
The honest trade: They do not prevent shrinkage by themselves, and the 25% figure is the brand's own claim, not a test we could check. The review summary says static results are mixed; some owners still get static cling, especially with synthetics. We also recommend them in our non-toxic detergent guide as a replacement for dryer sheets.
Check price on AmazonOrdering any of these?
If you are not a Prime member, a free Prime trial gets you free, fast delivery on eligible items like the ones above, plus Prime Video. You can cancel before the trial ends.
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Try Prime freeHow to wash cotton and cotton shirts without shrinking
Cotton is the fabric people search about most, and it follows the rules above more closely than any other.
- Expect the first washes to shrink it most. That is relaxation shrinkage leaving the fabric. Treat the first few washes with the most care.
- Cold or warm, gentle cycle, inside out. Tees and knit shirts go in a mesh bag. Woven button-downs can go in loose.
- Never dry cotton to bone dry. Pull shirts out damp, shake them out, and hang them on a hanger or a rack. The weight of the damp fabric helps it hold its length.
- "Pre-shrunk" means less, not none. Pre-shrunk cotton has been through a shrinking process at the factory, so there is less left to lose, but it can still shrink a little if it is dried hot and bone dry.
- Denim is cotton too. Wash jeans inside out in cold water, and hang them to dry. Raw or unwashed denim shrinks more than regular jeans; check the label.
Sweatpants, joggers, hoodies and leggings
Fleece sweatpants and hoodies are usually cotton or cotton blends, so they shrink in length, especially in the legs and sleeves. Wash them inside out on a gentle cycle in a large mesh bag, and dry them on a rack or pull them out of the dryer damp. Leggings and joggers with spandex should not go in a hot dryer at all: heat damages the stretch fibers before it shrinks the fabric.
Do new clothes shrink in the first wash?
Often, yes, and more than in any later wash. A new cotton garment still carries the tension from manufacturing, and the first time it gets wet and tumbled, that tension is released. If something fits perfectly off the rack and is 100% cotton, wash it cold on gentle and air-dry it the first few times.
Washing new clothes before wearing them is a good habit for other reasons too, especially for babies. We cover that in why you should wash new baby clothes before the first wear.
How to read a care label
US labels can use words, symbols, or both. The words have official meanings, set out by the FTC's Care Labeling Rule. Here are the ones that matter for shrinkage.
| Symbol on the label | What it means | Why it matters for shrinkage |
|---|---|---|
| A washtub | Machine wash. Dots inside show the maximum temperature: one dot for cold, more dots for warmer. | The maximum, not the target. Going cooler is always allowed. |
| A washtub with one line underneath | Permanent press cycle | A cool-down or cold rinse, then a reduced spin, to limit creasing |
| A washtub with two lines underneath | Gentle or delicate cycle: slow agitation and reduced time | This is the setting that limits relaxation shrinkage and felting. |
| A hand in a washtub | Hand wash only | Usually wool or delicate knits. A machine, even on cold, risks felting. |
| A square with a circle inside | Tumble dry. Dots show the heat; no dots means any heat, including hot. | "Tumble dry" alone means the maker allows hot. You can still stop early. |
| A square with a filled black circle | Tumble dry with no heat, air only | For fabrics that heat would damage |
| A square with a curved line at the top | Line dry: hang damp from a line or bar | The label is telling you not to use the dryer. |
| A square with one horizontal line | Dry flat: lay it out horizontally | Knits and wool. Hanging them wet stretches them out of shape. |
| A square with three vertical lines | Drip dry: hang it dripping wet | For fabrics that should not be wrung or spun. |
| Any symbol with an X through it | Do not | Treat it as a warning, not a suggestion. |
One detail worth knowing: under the FTC's definitions, "tumble dry" with no temperature means the maker expects the garment to survive a hot setting. It does not promise zero shrinkage.
Shrinkage by fabric at a glance
| Fabric | Shrinks? | How to wash | How to dry |
|---|---|---|---|
| Cotton (tees, shirts, sweats) | Yes, most in the first few washes | Cold or warm, gentle, inside out | Take out damp; finish on a rack or hanger |
| Wool and cashmere | Yes, by felting, mostly permanent | Hand wash cool, or wool cycle only if labeled machine washable | Press water out, dry flat. Never tumble. |
| Denim | Some; raw denim more | Cold, inside out | Hang to dry |
| Linen | Some, mainly the first wash | Cold or warm, gentle | Hang or dry flat while damp |
| Rayon / viscose | Yes, and it is weak when wet | Hand wash or gentle, cold; check for dry clean | Dry flat or hang; no dryer |
| Polyester, nylon | Very little | Any cycle the label allows | Low heat; high heat can distort |
| Spandex blends (leggings, stretch jeans) | Stretch fibers wear out with heat | Cold, gentle | Air-dry |
Already shrunk something? What you can and cannot fix
Cotton that has relaxed back can sometimes be coaxed part of the way out again. The method most guides describe is a soak of about 20 minutes in lukewarm water with roughly a quarter cup of hair conditioner or baby shampoo, which helps the fibers slide. Press out the water without wringing, then gently stretch it back into shape and dry it flat, stretching again as it dries. Expect a partial result, not a full size back.
Do not leave it soaking overnight. Tom's Guide warns that long soaks in conditioner can affect the fabric and cause printed logos on graphic tees to peel. (source)
Felted wool is a different story. Once the scales have locked together, soaking and stretching rarely brings it back to its original size. The only real fix for wool is prevention.
If a garment is not smaller but just creased from a gentle, low-heat dry, that is easy: see our guide to getting wrinkles out without an iron, or our picks for the best handheld garment steamer.
Questions people ask
Does cold water shrink clothes?
It can. Cold water is gentler and helps colors last, but most shrinkage comes from cotton soaking up water, the tumbling of the machine and drying the load bone dry. A cold wash followed by a long hot dry can still shrink a cotton shirt.
Does washing clothes shrink them, or is it the dryer?
Both. The wash starts it by letting wet cotton fibers relax, and drying to bone dry locks it in. The dryer usually gets the blame because that is when you notice it.
Does the delicate cycle stop clothes from shrinking?
It helps a lot. The FTC defines the delicate or gentle cycle as slow agitation and reduced time, and agitation is one of the main causes of shrinkage. It is not a guarantee if you then over-dry.
Does low heat in the dryer prevent shrinking?
Less than you would think. A 2003 study on cotton found the dryer's temperature setting had no effect on shrinkage. Stopping the dryer while clothes are still slightly damp matters more.
How do I dry clothes without shrinking them?
Air-dry on a rack or line, or use the dryer for a short cycle and take clothes out while they are still faintly damp. Dry knits and wool flat.
Does pre-shrunk cotton shrink again?
A little. Pre-shrunk cotton has less shrinkage left in it, but hot, bone-dry drying can still take off some length.
How do I wash wool without shrinking it?
Hand wash in cool water with a gentle wash, or use a wool cycle only if the label says machine washable. Do not wring it, and dry it flat. Keep it out of the dryer.
Do dryer balls stop clothes from shrinking?
No. They can shorten drying time, which helps only if you still take the clothes out slightly damp.
Can you unshrink clothes?
Cotton, partly: a short lukewarm soak with hair conditioner, then gentle stretching and drying flat. Felted wool usually cannot be reversed.
Editorial note
As an Amazon Associate we earn from qualifying purchases. Cupindy earns a commission if you buy through the Amazon links on this page, at no extra cost to you. No brand paid to be included, and every pick names a real drawback. Product details and availability were checked in September 2026 and can change.
Sources reviewed: Sammy Wang, P&G laundry scientist, interviewed by Martha Stewart, June 2025; Higgins, Anand, Hall and Holmes, Effect of tumble-drying on selected properties of knitted and woven cotton fabrics, Part II, Journal of the Textile Institute, 2003; Woolmark, machine washable wool; FTC Care Labeling Rule, glossary of standard terms, 16 CFR Part 423 Appendix A; Tom's Guide on the conditioner unshrink method; Amazon listings and review summaries for each product named.
Related reading: How to get wrinkles out without an iron · Best handheld garment steamer · Best non-toxic laundry detergent · Washing new baby clothes
