Short answer: buyers use cotton-polyester blends for bulk orders because, compared with 100% cotton of similar construction, a blend usually wrinkles less, shrinks less, dries faster and keeps its shape better through frequent washing, which matters for uniforms, team and event tees, workwear and fleece. The trade-offs are a less cotton-like feel, more visible pilling on some fabrics, two fibre types to dye, and limits on some print methods. A blend is the right call when easy care and consistency across many units matter more than a pure-cotton hand feel.
For tees specifically, see what changes in polyester-cotton tees versus 100% cotton. For the general fibre choice, see cotton or polyester for clothing production. This page is about specifying a blend for a large order.
When a blend fits a bulk order, and when it does not
| Use | Blend usually suits it? | Why |
|---|---|---|
| Uniforms and workwear washed often | Usually yes | Lower shrinkage and wrinkling help sizing stay consistent across reorders. |
| Event, team and promotional tees | Often yes | Easy care; check the print method first (see below). |
| Sweatshirt fleece and hoodies | Often yes | Common for durability and shape; see fabric choices for a custom hoodie. |
| Premium basics sold on “soft cotton” feel | Often no | Buyers expect a cotton hand and natural look. |
| Products marketed as natural-fibre or organic | No | The claim would not match the fibre content. |
| Hot-weather wear where absorbency matters | Depends | Polyester absorbs little moisture; comfort depends on yarn, knit and finish. |
What to write into a bulk blend specification
- Fibre content as it will appear on the label. Trade terms such as CVC (cotton-majority) or TC (polyester-majority) are not label terms. In the U.S. the label must show generic fibre names and percentages by weight under 16 CFR Part 303, and the actual content may differ from the stated figure by no more than 3 percent of total fibre weight (16 CFR 303.43; for example, a label stating 40% allows 37–43%). Ask the mill for the content on its fabric report.
- Yarn and knit. Ring-spun or open-end, combed or carded, and the knit structure change hand feel and pilling. See combed vs carded cotton jersey.
- Fabric weight with a tolerance, measured by a named method such as ASTM D3776.
- Shrinkage limit by a named wash method (AATCC TM135, or ISO 6330 with ISO 5077). See how to write a shrinkage limit into a fabric spec.
- Colour fastness to washing (for example ISO 105-C06) and pilling (ISO 12945-2 or ASTM D3512), with the minimum grade you will accept. See a minimum colour fastness test set.
- Shade rules across dye lots, because a big order is often dyed in several lots. See shade bands.
Dyeing and printing points to settle early
Polyester is normally dyed with disperse dyes and cotton with dyes for cellulose fibres such as reactive dyes, so a blend usually needs both fibres brought to one shade. That is a common source of lot-to-lot variation, so approve the lab dip on the actual blend fabric, not on a cotton or polyester swatch. On printing: sublimation dye bonds with polyester but not with cotton, so prints look duller on blends (why sublimation is dull on cotton-blend tees), and light inks on dyed polyester can pick up colour from the fabric (dye migration).
Steps for a consistent bulk blend order
- Choose the blend for the end use and care conditions, not for the lowest price per kilogram.
- Get a fabric swatch and the mill’s test report on that fabric, not a similar one.
- Approve the lab dip and a pre-production sample in the bulk fabric.
- Agree the fabric and garment tests and their limits in the order.
- Inspect bulk with an agreed sampling plan such as ISO 2859-1, including shade and measurements.
Fact, recommendation, uncertainty
Fact: the U.S. fibre-content label rules and the 3 percent tolerance above come from 16 CFR Part 303. Recommendation: state test methods and limits; words like “low shrink” or “colourfast” cannot be checked. Uncertainty: how a particular blend performs depends on yarn, knit and finishing, so a ratio such as 60/40 or 50/50 does not guarantee a result by itself. If you claim recycled polyester, the claim needs evidence (FTC Green Guides, 16 CFR 260.13).
Where Knitwear Base fits
Knitwear Base makes knit garments, including programs in cotton-polyester blends. For the blend fabrics a factory can typically offer, see cotton and polyester blend fabrics a factory can offer; for how blend garments are made, see making cotton-polyester blend garments; or use the contact page.
Sources and further reading
- eCFR, 16 CFR Part 303, Rules under the Textile Fiber Products Identification Act
- eCFR, 16 CFR 303.43, Fiber content tolerances
- ASTM D3776/D3776M, Standard Test Methods for Mass Per Unit Area (Weight) of Fabric
- AATCC TM135, Dimensional Changes of Fabrics after Home Laundering
- ISO 6330:2021, Domestic washing and drying procedures for textile testing
- ISO 5077:2007, Determination of dimensional change in washing and drying
- ISO 105-C06:2010, Colour fastness to domestic and commercial laundering
- ISO 12945-2:2020, Fabric propensity to surface pilling, fuzzing or matting: modified Martindale method
- ASTM D3512/D3512M, Pilling resistance of textile fabrics: random tumble pilling tester
- ISO 2859-1:2026, Sampling procedures for inspection by attributes (AQL)
- eCFR, 16 CFR 260.13, FTC Green Guides: recycled content claims
Rules and standards are summarised from their official pages for general guidance; this is not legal advice. Check the current version and the requirements of your own market before you rely on them.
