Cotton vs Polyester Blends: Which T-Shirt Fabric Is Better?

October 22, 2026 C.B. Shaw

Which is better for a t-shirt, cotton or a cotton and polyester blend? Neither wins every round. Cotton drinks up sweat and feels natural. Polyester shrugs off wrinkles and shrinking and dries out fast. A blend tries to give you a bit of both, like asking two people with opposite talents to share one job. Whether the blend is the better shirt depends on what you do in it. A lazy Sunday and a sweaty July wedding are different jobs, and this post walks through which fiber is the better employee for each.

We sell all three kinds: 100 percent cotton tees, cotton and polyester blends, and a few with other fibers mixed in. So we have no horse in the race. We are going to tell you what the research says, where the research is thin, and where a claim you see online is just a claim. Along the way we will keep things plain, because fabric talk has a bad habit of sounding like a chemistry final.

What is cotton, in plain English?

Cotton is a plant fiber. It grows as a fluffy boll on the cotton plant, gets spun into thread, and gets woven or knit into cloth. Because it is a plant, it behaves like one: it soaks up water easily. Wikipedia lists cotton's moisture absorption at around 8.5 percent of its own weight under normal conditions, and a textile trade article puts the number at roughly 7 to 8.5 percent. In everyday terms, that means cotton can take on a noticeable amount of moisture before it feels wet.

Cotton has an odd party trick too: it is stronger wet than dry. Wikipedia lists its strength at 3.0 to 5.0 grams per denier when dry and 3.3 to 6.0 when wet (denier is just a unit for how thick a thread is). So a soaked cotton shirt is not weaker than a dry one. It is also, in everyday life, the fiber with the soft, familiar feel that people picture when they say “a comfy tee.”

What is polyester, in plain English?

Polyester is a plastic fiber. It is made from chemicals rather than grown, and we explained the full family tree in our post on PET, PTT and PBT. The properties people care about are almost the opposite of cotton's. Wikipedia describes polyester as most admired for its ability to resist wrinkling and shrinking when washed. It has low water absorption, in the textile trade article's numbers about 0.4 percent, compared with cotton's 7 to 8.5. It is also described as having high strength, and blends with cotton are described as strong and resistant to wrinkles and tears.

Put those side by side and you can see why the two are always getting blended. One drinks. One does not. One is soft and familiar. One shrugs off the dryer.

The big comparison

	Cotton	Polyester	Blend
Soaks up sweat	Yes, roughly 7 to 8.5 percent of its weight	Barely, about 0.4 percent	In between, depending on the ratio
Wrinkles	Tends to wrinkle	Resists wrinkles	Described as wrinkle-resistant
Shrinks in the wash	Cotton typically shrinks the most in the first wash	Resists shrinking	Less likely to shrink than pure cotton
Static cling	Described as neutral	Highly sensitive to static	Some static, depending on ratio
Strength	Stronger wet than dry	High strength	Strong and tear-resistant
Origin	Plant	Petroleum-based plastic	Both

That table is the sources lined up in one place, not a lab test of any one shirt. A well-made cotton tee and a cheap one are still very different things, and the same goes for blends.

Why do shirt makers blend them at all?

Wikipedia puts it simply: polyester is often blended with other fibers like cotton to get the desirable properties of both materials. In practice, makers are trying to fix cotton's weak spots (wrinkles, shrinking, wearing out) while keeping its good ones (feel, absorbency). It is a compromise, and compromises are fine when you know what you are getting.

Retailers describe the common blends like this. These descriptions come from t-shirt sellers rather than a standards body, so brands do not always use the terms the same way, and the order of the numbers changes depending on who is writing:

CVC (short for “chief value cotton”) is described as about 60 percent cotton and 40 percent polyester, meant to be softer than plain cotton while staying affordable, with the extra strength and wrinkle resistance coming from the polyester.
65/35 polyester and cotton is described by one seller as the most common blend, with enough polyester to give it shrink resistance, though it can cling and feel less comfortable on skin because of the higher polyester content.
50/50 is described as more breathable than 65/35 and popular for sports.
Tri-blends are often described as about 50 percent polyester, 25 percent cotton and 25 percent rayon, known for a lightweight feel and soft drape. (Rayon is a plant-based fiber, and we cover it in our viscose post.)

Watch that numbering. When a seller writes 65/35, ask which one is the cotton. In some stores the first number is the polyester and in others it is the cotton. Always read the full fiber list, not the shorthand.

The shrinking question

Everybody has shrunk a shirt. Here is why it happens, explained like you are ten. Cotton fibers are stretched out straight during manufacturing and held under tension. When heat, water and the churning of the washing machine come along, the fibers relax and pull back toward their natural shape. The shirt gets smaller. Hot water makes it worse because it weakens the tiny bonds that hold the fibers in place, though cold water can still cause some shrinking, just less. Polyester and nylon are made of very stable plastic chains that do not relax that way, so they shrink much less. A tighter weave also shrinks less than a loose knit.

Whirlpool, the appliance maker, adds some numbers for cotton: cotton fibers swell with water or heat and then tighten, and cotton typically shrinks the most during its first wash. Pre-shrunk cotton might shrink about 2 to 5 percent, while cotton that was not pre-shrunk can shrink up to about 20 percent. Blends with polyester, rayon or spandex are less likely to shrink. (“Pre-shrunk” means the fabric was washed or treated at the factory so it has less shrinking left to do.) We covered how fabric weight plays into this in our GSM post, where heavier 100 percent cotton can shrink more in the first wash if it was not pre-shrunk.

One interesting wrinkle (pun intended). Textile World reported on research by Cotton Incorporated finding that tumbling, not just heat, drove shrinkage in a cotton knit: fabric tumbled with no heat still shrank by over 20 percent after 45 minutes, and loads dried at two different high temperatures shrank by about the same amount, only faster. That is a secondary report with no clear date, and it disagrees a bit with the idea that heat is the main villain, so take it as a reason to be gentle overall: less time in the dryer is better either way.

Which one makes you sweat more? The comfort research

This is the question everybody really wants answered, and honestly, the evidence is thin and a bit biased. Here is what exists:

The cotton industry's own research. A bulletin from Cotton Incorporated, the cotton promotion group, reported that the more cotton a garment contained, the more comfortable it felt, but only under conditions that caused mild sweating. At the highest heat and humidity, wearers preferred 100 percent cotton shirts over cotton and polyester blends. Remember who paid for that study.
A tiny independent study. A 1999 conference abstract summarized by San Diego State University had eight people cycle for an hour in a hot, humid room wearing either 100 percent cotton or a 50/50 cotton and polyester shirt. It found no difference between the fabrics for sweat absorption and retention or heat loss. Some participants even rated the blend as thinner and more pliable, and some preferred how it felt. Eight people is not a lot.

So the honest summary is: nobody has proven that blends are hotter or cooler than cotton in everyday wear, and the two best-known studies point in different directions. Your own skin is the best test. If you run hot, try both and trust your skin.

What about smell?

Here is a fun one. A Ghent University study of shirts worn by 26 cyclists after an hour-long workout found that polyester shirts smelled worse than cotton ones. Both the microbe testing and a human smelling panel agreed. The lead researcher said bacteria called micrococci grow better on polyester. That study was about pure polyester, not blends, and it was a workout scenario, so do not read it as a verdict on your everyday blend tee. But it does fit a pattern: a fiber that does not absorb sweat is not necessarily a fiber that stays fresh.

The numbers behind your closet

Zoom out for a second. According to Textile Exchange's 2025 Materials Market Report, polyester made up about 59 percent of global fiber production, roughly 78 million tonnes in 2024. Cotton was around 24.5 million tonnes in 2023 and 2024. So when you reach into a closet, you are very likely holding some polyester. It is not a niche material. It is the default one.

The water question, handled carefully

You have probably seen that a cotton t-shirt takes around 2,700 liters of water, which is about 713 gallons. That number is quoted a lot by brands and groups like WWF. It is also disputed. At a panel reported by FashionUnited, one expert called the global average “meaningless” because the water is “borrowed” and returns to the system, another pointed out that much of cotton's water is rainfall and that irrigated and rain-fed crops are very different, and a cotton grower pointed to large regional differences and to drip versus flood irrigation. Wikipedia lists a global average of 8,000 to 10,000 liters of water per kilogram of cotton and possibly more in dry regions. We are not going to hand you one tidy figure, because there is not one. And we do not have verified numbers for polyester's footprint, so we are not going to guess at a comparison. If a brand tells you flatly that one fiber is the “green” one, ask for the study.

Cotton vs polyester myths, busted

Myth: “Polyester is always hotter.” The studies we found conflict, and the biggest one was funded by a cotton group. Not settled.
Myth: “Blends do not shrink.” Less likely to shrink, not immune. Blends with more cotton can still shrink some.
Myth: “Cotton is always better for your skin.” We did not find a trustworthy study proving it. Plenty of people prefer cotton. That is a preference, not a rule.
Myth: “The water number for a cotton shirt is settled.” It is not. The popular figure is widely used and widely disputed.
Myth: “Natural means no shedding.” Cotton sheds fibers too. In the 2019 study we covered in our microplastics post, a garment with a cotton and modal back shed mostly plant-based fibers. They are not plastic, but nobody has said they are harmless either.

What is in our blends?

We list every percentage on the product page, so here is the real lineup:

Sorona cotton blend tees. The women's and unisex crewnecks and the women's ringer are 81.4 percent cotton and 18.6 percent polyester (Sorona), at 230 gsm (6.8 oz). The unisex heavyweight is 67.4 percent cotton and 32.6 percent polyester (Sorona), at 300 gsm (8.8 oz). Sorona is a type of polyester, and we explained what makes it different in Sorona vs polyester.
The leopard waffle tee. 62 percent cotton and 38 percent polyester, at 320 gsm (9.4 oz), in a thick waffle knit.
100 percent cotton tees. Our oversized graphic tees run 100 percent cotton at about 300 gsm (8.8 oz) or 305 gsm (9.0 oz).

Notice that none of these are mostly polyester. We like cotton-forward blends, and we think you should know exactly how much of each you are buying.

So which should you buy?

Soft, familiar, everyday feel: 100 percent cotton.
You hate shrinking and wrinkles: a blend. More polyester means less shrinking, according to the sources above.
You sweat a lot: try both. The research does not give a clear winner.
You want a shirt that holds its shape over many washes: a cotton-forward blend is a good middle road.
You care about plastic: check the fiber list. A shirt that is 81 percent cotton is a very different thing from one that is 65 percent polyester.
You do not know: buy one of each and let your own skin vote.

Questions people ask

Is a cotton polyester blend better than 100 percent cotton?

Not always. A blend resists wrinkles and shrinking better, according to the sources above, while 100 percent cotton absorbs more sweat and has the familiar natural feel. Which is better depends on what you want from the shirt.

Do cotton polyester blends shrink?

They are less likely to shrink than 100 percent cotton, but blends with more cotton can still shrink somewhat. Cotton typically shrinks the most in its first wash.

How much does cotton shrink?

Whirlpool says pre-shrunk cotton might shrink about 2 to 5 percent, and cotton that was not pre-shrunk can shrink up to about 20 percent.

Which is cooler, cotton or polyester?

The evidence is mixed. A cotton industry study found 100 percent cotton shirts preferred in the hottest, most humid conditions. A small independent study found no difference in sweat absorption or heat loss between cotton and a 50/50 blend. Try both and trust your own skin.

Why does polyester smell worse than cotton?

A Ghent University study found that bacteria called micrococci grow better on polyester, and polyester shirts smelled worse than cotton after a workout. It tested pure polyester, not blends.

What does CVC mean on a t-shirt?

Short for “chief value cotton.” Sellers describe it as about 60 percent cotton and 40 percent polyester, meant to be softer than plain cotton and more affordable. Brands use the term loosely, so read the fiber list.

What is a tri-blend t-shirt?

A blend of three fibers. Sellers often describe it as about 50 percent polyester, 25 percent cotton and 25 percent rayon, with a lightweight feel and soft drape.

Is polyester a plastic?

Yes. Polyester is a plastic fiber made from petroleum-based chemicals. The same plastic is used for drink bottles.

How much of the world's fiber is polyester?

According to Textile Exchange's 2025 report, polyester made up about 59 percent of global fiber production, roughly 78 million tonnes, in 2024.

How much water does a cotton t-shirt use?

A figure of about 2,700 liters (roughly 713 gallons) is widely quoted, but it is also disputed. Experts point out that much of cotton's water is rainfall and that irrigation methods and regions vary a lot.

Does cotton shed microfibers too?

Yes. In a 2019 study, a garment with a cotton and modal back panel shed mostly plant-based fibers. Those are not plastic, but the study does not say they are harmless.

What blend are your tees?

Our Sorona crewnecks and ringer are 81.4 percent cotton and 18.6 percent polyester (Sorona). Our heavyweight Sorona tee is 67.4 percent cotton and 32.6 percent polyester (Sorona). Our oversized graphic tees are 100 percent cotton.

Why do some blends cling and feel less comfortable?

Polyester is described as highly sensitive to static electricity. One seller notes that blends with a higher polyester share can cling and bother some people's skin. Cotton-forward blends are less likely to.