Cotton, Polyester or Blends? T-Shirt Fabrics Explained

Last chapter you learned to read a t-shirt's weight. This chapter covers the other half of the fabric story: what the shirt is actually made of. Two garments at an identical GSM can feel, wear, wash and print like completely different animals.

Every garment listing declares its material: "100% cotton", "100% polyester", "65/35 poly-cotton". Just like GSM, that line quietly tells you most of what you need to know. This chapter is for anyone choosing garments for merch, workwear, team kit or giveaways, and by the end you'll be able to read a fabric line and know immediately whether it suits your job.

New to the series? This is Chapter 5 of Making Merch People Actually Wear, and Chapter 1 has the full map.

Cotton: the natural default

Cotton is a plant fibre, and it's what most people picture when they picture a t-shirt: soft against the skin, breathable, and comfortable across seasons. For merch that people wear casually (band tees, café shirts, charity supporter gear), cotton is the default for good reason: it's what your audience's favourite shirts are probably already made of.

A couple of terms you'll meet on cotton listings, translated:

• Ringspun cotton: cotton spun by a method that produces a finer, smoother yarn, so the fabric feels noticeably softer than basic cotton. Common on mid-range and premium tees.
• Combed cotton: cotton that's been combed to remove shorter, coarser fibres before spinning, again giving a smoother finish. Often appears together with ringspun.

You don't need to memorise the manufacturing. Just know that these words on a listing signal a softer-feeling shirt, usually at a slightly higher price.

Cotton's honest trade-offs: it absorbs moisture rather than moving it away, so it holds sweat and dries slowly. Fine at a gig, miserable on a five-a-side pitch. And depending on the garment and how it's washed, cotton can shrink; care labels exist for a reason, and there's a whole washing chapter coming in Part 7.

Scenario: the band from Chapter 3 selling heavyweight black tees to fans. Cotton, no debate. The audience wants a classic tee that feels like their favourite shirt, and nobody's running a marathon in it.

Polyester: the performance workhorse

Polyester is a synthetic fibre, and it behaves almost like cotton's mirror image: it holds very little moisture, dries quickly, resists creasing and shrinking, and keeps its shape and colour well through heavy use. That combination is why sports kit, running shirts and activewear are overwhelmingly polyester territory.

The trade-offs, honestly stated: polyester doesn't breathe the way cotton does, and against the skin it feels more "technical" than soft. Some people love that athletic feel; others find it plasticky. It can also hang onto odours more stubbornly than cotton between washes, which regular sports-kit wearers will recognise.

One more thing worth knowing: fabric affects printing. Different fibres take print differently, and polyester in particular has quirks your printer will plan around, which is one of several reasons to name your garment before the artwork is finalised, not after. (Printing methods get their own chapter in Part 4.)

Scenario: the five-a-side team. Polyester kit, clearly. It's built for exactly this: sweat, movement, weekly washes, and drying on a radiator by Thursday's training.

Blends: the pragmatic middle

A blend is simply a fabric spun from more than one fibre, and the listing tells you the recipe: "65/35" means 65% of the first-named fibre, 35% of the second.

Poly-cotton (polyester + cotton, in various ratios) is the pragmatism champion: more durable and shrink-resistant than pure cotton, softer and more breathable than pure polyester, and typically easy on the budget. This is why so much workwear lives here: polos, work tees and uniforms that get washed constantly and need to look respectable for years. Less romantic than pure cotton, harder-wearing in daily service.

Tri-blends (typically cotton + polyester + a third fibre, often viscose or similar) chase a different prize: a notably soft, lightweight, slightly heathered look and drape that fashion-led merch loves. The trade-off is usually a lighter, more delicate fabric at a higher price. Lovely for a premium fashion-fit tee, wrong for a scaffolder's workwear.

Scenario: the plumbing firm from Chapter 3: five staff, daily wear, quality-and-durability lean. Poly-cotton polos are the textbook answer. They survive the van, the washing machine and the years, while staying presentable on a customer's doorstep.

The fabric-to-job cheat sheet

Fabric choice is Chapter 2's job question wearing different clothes:

• Everyday sellable merch (bands, cafés, creators): cotton, with ringspun or combed if the budget leans quality.
• Sport, running events, active team kit: polyester.
• Workwear and uniforms washed constantly: poly-cotton blends.
• Premium fashion-feel merch: heavier ringspun cotton, or a tri-blend for the soft drape.
• Big-volume giveaways: basic cotton or poly-cotton, whichever your budget and quantity maths prefer, per Chapter 3.

And remember the pairing from last chapter: fabric type + fabric weight together describe the garment. "Heavyweight ringspun cotton" or "lightweight polyester" tells you and your printer almost everything; either half alone tells you half a story.

Reading a listing like a pro

Put Chapters 4 and 5 together and a garment listing decodes in seconds:

Five checks, thirty seconds, and you've out-shopped most first-timers.

Common mistakes (and how to avoid them)

1. Buying cotton for sport. Comfort fabric, wrong arena: it holds sweat and dries slowly. Fix: active use means polyester or a performance-leaning blend.

2. Buying polyester for comfort-first merch. Fans expecting a classic soft tee will notice. Fix: casual everyday merch defaults to cotton.

3. Ignoring the blend ratio. "Poly-cotton" spans a wide range; the numbers change the feel. Fix: read the ratio, not just the word.

4. Judging fabric by price alone. The cheapest garment in the wrong fibre costs more in disappointment. Fix: fabric-to-job first, price second, and revisit your lean from Chapter 3.

5. Choosing tri-blend for heavy-duty use. Its delicacy is the point, and the problem. Fix: save tri-blends for fashion-led merch; give workwear to poly-cotton.

6. Finalising artwork before naming the fabric. Fabric shapes how a design is best printed. Fix: tell your printer the garment early; it's a one-line email that prevents a headache.

FAQs

What's the best fabric for merch t-shirts?
For everyday sellable merch, cotton is the usual answer, with ringspun if you're leaning quality. But "best" always depends on the job: sport says polyester, hard-washed workwear says poly-cotton.

What does 65/35 mean on a garment?
The blend ratio: 65% of the first-listed fibre, 35% of the second. On a typical poly-cotton workwear polo, that's 65% polyester, 35% cotton.

Is polyester lower quality than cotton?
No. It's different, not worse. Polyester outperforms cotton for sport and durability; cotton wins on softness and breathability. Quality is how well the fabric fits the use.

What is ringspun cotton in one sentence?
Cotton spun into a finer, smoother yarn, making a softer-feeling shirt, and a quality signal on a listing.

Do different fabrics print differently?
Yes: fibre affects how a print is best applied, which is why your printer wants the garment named early. Methods get their own chapter in Part 4.

Which fabric shrinks?
Cotton is the shrink-prone one, depending on garment and washing; polyester largely holds its size, and blends sit in between. Care instructions are your friend, and there's a full washing chapter coming in Part 7.

What fabric for a charity fun run?
Running event = polyester logic, budget giveaway = cost logic; a budget-friendly polyester or poly-cotton tee usually squares that circle. Ask your printer what fits your quantity.

What's next in the book?
Chapter 6: sizing, fits, and ordering the right size mix. It's the part of garment choice that most scares first-timers, made unscary.