Why T-Shirts Shrink and How to Stop It
A black printed t-shirt, used to illustrate fabric shrinkage and care
A shirt that fitted perfectly and now sits above your waistband did not shrink because it was cheap. It shrank because of how it was made, and then how it was dried.
Why cotton shrinks
Cotton fibres are stretched under tension during spinning and knitting. That tension is held in the fabric like a wound spring. Heat and water relax it, and the fibres contract back toward their natural length.
This is why shrinkage happens mostly in length rather than width, and why the first wash does most of it. It is a release of stored tension, not damage.
How much shrinkage to expect
| Fabric | Typical shrinkage |
|---|---|
| 100% cotton, untreated | 3–5% |
| 100% cotton, pre-shrunk | 1–3% |
| 50/50 blend | 1–2% |
| Tri-blend | Under 1% |
| 100% polyester | Almost none |
On a 29-inch medium tee, 4% is a little over an inch of length. That is the difference between a shirt that covers your waistband and one that does not.
Pre-shrunk means mostly shrunk
Pre-shrunk fabric is washed at the mill before cutting, releasing most of that tension in advance. It does not mean shrink-proof — expect another 1–3% on a hot wash. It means the surprise is smaller.
The four rules
- Wash cold. Under 30°C / 86°F. Hot water does most of the damage.
- Skip the dryer, or use low. Tumble drying on high causes more shrinkage than washing ever does — the combination of heat and mechanical agitation is the worst case.
- Hang or lay flat to dry. Hanging while damp lets gravity hold the length.
- Do not overdry. Taking a shirt out slightly damp preserves both length and shape.
These also happen to be the rules for protecting a printed design, so there is no trade-off.
Can you unshrink a shirt?
Partially, and it is worth trying.
- Fill a basin with lukewarm water and add a tablespoon of hair conditioner or baby shampoo.
- Soak the shirt for 30 minutes. This relaxes the fibres.
- Squeeze out water gently — do not wring.
- Lay it on a towel, roll to remove more water, then lay flat.
- Gently stretch it back toward its original dimensions and pin or weigh down the edges.
- Let it air dry completely.
Realistically you recover perhaps half the loss. It works better on cotton than on blends, and it will not fix a shirt that has been repeatedly hot-dried for a year.
Buying to allow for it
If you machine dry on high regularly, factor roughly half a size of length loss into your choice. Length is the dimension that moves — width changes far less — so if you are between sizes and prefer longer shirts, size up. Our size chart lists both chest width and body length so you can plan for it.
Frequently asked questions
How much does a cotton t-shirt shrink?
3–5% untreated, 1–3% if pre-shrunk. Mostly in length, mostly on the first hot wash.
Does cold water stop shrinking?
It dramatically reduces it. Heat is the main trigger, from both washing and drying.
Can a shrunken shirt be fixed?
Partially. Soak in lukewarm water with conditioner, then stretch and air dry flat. Expect to recover about half.
Does polyester shrink?
Almost never. It is dimensionally stable under normal washing.
Should I size up to allow for shrinkage?
Only if you routinely tumble dry on high. Washing cold and drying low makes it largely irrelevant.
See how to wash printed shirts, or browse custom shirts.
