Why Cotton Preparation Matters
Cotton is not one uniform material. The fibres vary in length, strength and cleanliness, and the way they are processed into yarn determines how smooth, strong and soft the finished T-shirt will be. For a brand, this is one of the most valuable details to understand because it explains a large part of the price gap between a basic tee and a premium one, and gives you honest, specific language for describing your quality to customers.
Two separate decisions are often confused: how the fibres are prepared (carded or combed) and how they are spun (ring-spun or open-end). A yarn can be any combination of these, and the best-feeling T-shirts typically use combed, ring-spun cotton.
Carded vs Combed Cotton
Carded cotton is the standard process. Raw cotton is cleaned and passed through carding machines that open the fibres, remove debris and align them roughly into a loose rope called a sliver. It produces a perfectly serviceable yarn at a lower cost, but short fibres and small impurities remain, so the surface is slightly fuzzier and less even.
Combed cotton goes through an additional step. After carding, the fibres are passed through fine combs that pull out the short fibres and any remaining impurities. The discarded material, known as noil, can be a substantial share of the raw cotton. What is left is longer, cleaner and straighter, and the yarn made from it is smoother, stronger and more uniform. Because material is thrown away and the process takes longer, combed yarn costs more.
Ring-Spun vs Open-End Cotton
Spinning turns the prepared fibre into yarn. The two common methods are:
- Ring spinning continuously twists and thins the fibres on a ring-and-traveller system. The result is a finer, stronger and softer yarn with a smoother surface. It is slower and more expensive.
- Open-end (rotor) spinning is faster and cheaper but produces a coarser, bulkier yarn with a slightly rougher feel and lower strength.
When a T-shirt is described as “combed ring-spun cotton”, it means the fibres were both combed and ring-spun: the highest-quality common combination in everyday cotton tees.
Comparison: Carded Open-End vs Combed Ring-Spun
| Feature | Carded / open-end | Combed / ring-spun |
|---|---|---|
| Feel | Firmer, slightly rougher | Softer, smoother |
| Surface | More fuzz and variation | Cleaner and more even |
| Strength and durability | Lower | Higher |
| Pilling | More likely | Less likely |
| Print quality | Good | Often sharper on fine detail |
| Cost | Lower | Higher |
| Best for | Promotional tees, workwear, budget lines | Premium basics, retail and brand tees |
Neither is “wrong”. A promotional T-shirt that will be handed out at an event does not need premium yarn, while a brand tee priced at £30 or more should use quality fabric to justify its price. The key is to choose deliberately and describe it accurately.
Yarn Count and Fabric Weight
Two more numbers help specify a T-shirt fabric. Yarn count (for example 30s or 40s) describes how fine the yarn is; a higher count means a finer yarn and typically a lighter, smoother fabric. GSM describes how heavy the finished fabric is. As a rule of thumb, lightweight T-shirts sit around 140–160 GSM, a classic everyday tee around 160–200 GSM, and heavyweight or boxy streetwear tees around 200–260 GSM and above. These ranges are general trade bands and vary by supplier; you can read how GSM works for heavier garments in our hoodie fabric GSM guide.
Fabric weight and yarn quality interact. A heavier tee in carded open-end yarn can feel stiff, while the same weight in combed ring-spun can feel dense but soft. When you request quotes, ask the factory for both the yarn type and GSM so you compare like with like.
Premium Cotton Types: Pima, Supima and Organic
- Long-staple cottons such as Pima and Egyptian have longer fibres that make smoother, stronger yarns. Supima is a trademarked name for American-grown Pima cotton.
- Organic cotton is grown without synthetic pesticides and fertilisers and can be certified to standards such as GOTS (Global Organic Textile Standard) or OCS. Our organic cotton T-shirt guide explains how to verify claims.
- Blends with polyester, viscose or modal can improve drape, shrinkage resistance or softness, and change the price.
If you make fibre or sustainability claims on your T-shirts, they must be accurate and backed by evidence; see the sustainable sourcing strategy for how to build credible claims.
Finishing: Where Feel Is Often Won or Lost
Yarn is only part of the story. Pre-shrinking (sanforising) limits shrinkage in the wash, enzyme or bio-polishing removes surface fibres to reduce pilling and improve softness, and garment washing gives a lived-in handle. Poor finishing can leave a combed ring-spun tee feeling no better than a cheap one, so ask the factory what finishing is included and request test results for shrinkage and colour fastness. For jersey sourcing at volume, our jersey wholesale buying guide covers what to check.
Slub, Heather and Other Yarn Effects
Not every uneven yarn is poor quality. Slub yarn is deliberately spun with thick and thin sections to give a textured, casual look, and heather fabrics blend differently coloured fibres for a mottled effect. These are design choices that should appear in the specification, because an accidental irregularity and an intended slub look similar in a photo. Ask for a swatch or an approved standard so the bulk fabric matches the look you chose, and confirm the fibre content, since many heather colours use a polyester or viscose blend rather than 100% cotton.
How to Judge Fabric Quality in a Sample
- Feel it. Rub the fabric between your fingers; smooth and cool is typical of combed ring-spun, while a fuzzy, dry surface suggests carded open-end.
- Hold it to the light. An even weave of the knit suggests consistent yarn; thick-and-thin patches suggest otherwise (unless it is a deliberate slub).
- Stretch and release. The fabric should recover rather than bag.
- Wash it. Wash a sample several times and measure shrinkage, twisting and pilling.
- Ask for the documents. Request yarn specification, composition and test reports from the factory.
How to Specify T-Shirt Fabric to a Manufacturer
A short, precise specification prevents quiet downgrades. For example: “100% combed ring-spun cotton single jersey, 180 GSM ±5%, 30s yarn, pre-shrunk, enzyme-washed, colour as approved lab dip.” Place it in your tech pack alongside measurements, then approve a sample before bulk. Include fabric checks in your quality control plan, and remember that the pattern must allow for shrinkage; our size chart guide explains tolerance.
Choosing Fabric by Use Case
- Premium brand basics: combed ring-spun cotton, 30s to 40s yarn, 180 to 220 GSM, pre-shrunk and enzyme-washed. This is the quality customers associate with a T-shirt they keep for years.
- Heavyweight streetwear tees: combed ring-spun cotton at 220 to 260 GSM, with a ribbed collar that holds its shape and a boxy cut that suits the heavier drape.
- Everyday retail and multipacks: combed or semi-combed cotton at 150 to 180 GSM, balancing softness with cost.
- Printing and promotional tees: carded or open-end cotton can be perfectly good, especially for bulk screen-printed shirts where price drives the decision.
- Sustainability-led ranges: certified organic or recycled blends, with the certification documents ready before you make any claim.
Whatever you choose, stay consistent between samples, bulk and your marketing wording. If your product page says “premium combed cotton” and the labels or test reports show a different composition, you risk customer complaints and potential issues with misleading claims.
What Fabric Choice Does to Your Cost
Upgrading from carded open-end to combed ring-spun cotton raises the fabric cost per kilogram, and heavier fabric uses more material per garment, so your landed cost rises on both counts. That is fine if your price supports it. Work out the added cost per unit and compare it with the price your customer will pay using our pricing guide and manufacturing cost guide. In many cases a modest increase in fabric cost is outweighed by lower returns, better reviews and the ability to price higher.
T-Shirts at Ruhrose
Ruhrose produces custom T-shirts and jersey garments in Bangladesh using fabrics ranging from carded basics to combed ring-spun and organic cotton, with low minimums from 500 pieces per style and colour. We can show you fabric options at different price points, so you can choose the right quality for your brand. Start a product enquiry to discuss your T-shirt range.