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Should You Wash a Hoodie Inside Out?

What washing inside out actually protects on a heavy hoodie, what it does nothing for, and what the published test methods do and don't settle.

Turning a hoodie inside out before it goes in the drum takes about four seconds. The question is whether those four seconds buy anything, or whether it is one of those laundry habits that gets handed down without anybody checking it.

The short version. It helps, and the reasons are well documented. But the reasons are narrower than most advice suggests. It protects the outer face of the cloth and anything printed on it. It does nothing for shrinkage. It does nothing for smell. And as far as we can find, no standards body has published a method that tests the trick itself, so part of what gets said about it is habit rather than evidence.

A wash cycle is abrasion as much as it is soap

This is the part that makes the rest make sense. Laundering is not a chemical bath that a garment sits still in. It is cloth rubbing against cloth, against itself, and against the drum, in water, for half an hour.

The people who write the test methods treat it that way. AATCC's TM61, Test Method for Colorfastness to Laundering: Accelerated, describes what it reproduces as the colour loss and surface change caused by the detergent solution and the abrasive action of roughly five typical hand or home launderings, compressed into a single 45 minute run in a heated canister. Abrasion is written into the definition. It is not a side effect somebody noticed later.

Independent work counts the fibre that comes off. A 2024 study by Julapong and colleagues in Toxics measured fibre fragments released by top-loading machines and found the load mass mattered a great deal: about 1,975 particles per litre at a 0.5 kg load against about 3,978 at 1.5 kg. Detergent dose made almost no difference in their runs. Their samples were woven, not knitted fleece, and they did not test repeated washes of the same garment, so read it as a general picture rather than a number for your hoodie. The picture is that cloth loses fibre in the wash, and that mechanical load drives it.

Whichever face is out takes the wear

Once you accept that a wash is a rubbing process, the argument for inside out is simple. The surface facing outwards is the surface doing the rubbing.

Two published methods measure what that rubbing does. ASTM International's D3512/D3512M-22 tumbles specimens in a chamber to see how readily a fabric forms pills and other surface change, then grades the result against visual standards from 5, no pilling, down to 1, very severe. ASTM's D4966-22 takes the other approach and rubs a specimen flat against a standard abradant on a Martindale tester, assessing breakdown, mass loss and change in appearance. Both apply to knits.

Both standards are also unusually blunt about their own limits, which is worth knowing before anybody quotes a pilling grade at you. D3512 says it is not recommended for acceptance testing because between-laboratory precision is poor, and that real outcomes in wear depend more on conditions of use and on the individual wearer than the laboratory result does. D4966 says the same thing about its own precision, and warns against leaning on small differences between labs. They tell you a fabric's tendency. They do not predict your hoodie.

Colour behaves the same way. AATCC's TM8, Colorfastness to Crocking: Crockmeter, measures how much colour transfers off a fabric surface when it is rubbed with white test cloth, dry and wet, graded on the Gray Scale for Staining or the Chromatic Transference Scale. Rubbing moves loose colour. A dark heavyweight hoodie has a lot of dye sitting in a lot of cotton, and the face that gets rubbed is the face that goes grey first.

What inside out actually protects

  • The printed area. A screen print or an embroidered patch is the least abrasion-tolerant thing on the garment. Turn it inwards and it spends the cycle rubbing against your own fleece rather than against a zip.
  • The outer face of the knit. On loopback and brushed fleece the outside is a flat jersey face. That is the surface where fuzz and pills read most obviously, because there is nothing else going on there to hide them.
  • The colour you can see. Abrasive colour loss shows up as a pale, slightly chalky cast on the high points: shoulders, front of the sleeves, the ridge of the hood. Facing that surface inwards is the cheapest thing you can do about it.
  • Hardware contact. A hoodie in a mixed load spends thirty minutes against jean rivets and bra hooks. Inside out puts a layer of cloth between them and the face.

What it does nothing for

Shrinkage, first. Dimensional change is measured by AATCC TM135, currently in its 2025 edition, which sets out four wash temperatures, three agitation cycles and four drying procedures and measures length and width change afterwards. What drives the result is heat, water and agitation acting on a relaxed knit structure. Orientation is not one of the variables the method controls. Turning a hoodie inside out will not save it from a hot wash.

Smell, second. Odour is a cleaning question, and cleaning is about water temperature, detergent and how long the garment has been left damp. We have written separately on whether a cold wash actually gets a hoodie clean and on how often a heavy hoodie needs washing at all. Inside out changes neither.

There is one small argument the other way that is genuinely sensible. On a hoodie, most of the soil is on the inside, because that is the side against skin. Turning it out puts the dirtiest face towards the water and the mechanical action. That is a reasonable thing to want. It is also the face made of raised loops or brushed nap, which is exactly the surface that fuzzes. You are choosing which side pays.

The dryer is where more of it happens

Look again at how D3512 works. It generates pills by tumbling specimens loose in a chamber with an air impeller. That is a tumble dryer with a grading scale attached. Dry heat, free tumbling and no water to lubricate the fibres is a harsher environment for a knit face than the wash itself.

So if you are only going to bother once, bother at the dryer. Better still, keep heavy sweats out of it. Our full routine lives in the care notes, and it is short.

Where the evidence runs out

Here is the honest part. Every source above tells you that laundering abrades fabric, and that abrasion degrades the surface it lands on. Nobody, as far as we can find, has published a controlled trial or a standard method that washes matched garments right side out and inside out and reports the difference over fifty cycles. The standards measure the damage. They do not measure the workaround.

So the recommendation rests on a chain of reasoning, not on a direct result. The chain is short and each link is documented, which is better than most laundry advice manages. It is still reasoning. Anyone telling you inside-out washing extends a garment's life by a specific percentage is making that number up.

One note on labels, since it comes up

In Canada the label has to give you fibre content and the dealer's identity. Care instructions are a different matter. The Competition Bureau states plainly that care labelling, whether in words or symbols, is a voluntary program here, though any care information given cannot be false or misleading and must reflect an appropriate method of care. The symbol standard, CAN/CGSB-86.1-2003, is sold separately by the Canadian General Standards Board. Which is to say: if a label says nothing about washing inside out, that silence carries no information at all.

How we do it

  1. Turn it inside out. Zip the zip, if it has one, so the slider is not free to chew on anything.
  2. Wash cold, on a gentle or normal cycle, with a load that is not crammed. More mass in the drum means more mechanical work on everything in it.
  3. Wash heavy sweats with other heavy sweats where you can. Denim rivets and towels are the two worst neighbours.
  4. Skip the dryer. Lie it flat or hang it on a wide support until it is dry all the way through the fleece.
  5. Turn it back the right way once it is dry, not while it is wet and heavy.

Four seconds, and the face of the cloth ages slower than the inside. That is the whole claim, and it is enough.

Sources

PreviouslyHow Much Detergent Does a Heavy Hoodie Need? NextWhy a Black Hoodie Looks Different in Every Light
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