How to think about blended fabrics

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With blended fabrics, the key question is simple:

👉 What is this fabric made of, and which material is doing most of the work?

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What to look at:

• which fibers are used

• the percentage of each material

• whether synthetic fibers are part of the blend

• whether the fabric has added treatments

• how the fabric is used (especially direct skin contact)

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Blending is usually done to change how a fabric performs. That can mean more durability, more stretch, lower cost, or easier care. But it also means the material is no longer a single, simple fiber. It becomes a combined system.

 

Where concern comes from

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Blended fabrics combine the characteristics of each material used.

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When synthetic fibers like polyester, nylon, or elastane are part of the blend, they introduce the same issues seen in synthetic fabrics:

• petroleum-based material

• chemical treatments and finishes

• microfiber shedding

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At the same time, natural fibers in the blend can still carry their own processing, such as dyes and finishing treatments. Blends are also more likely to go through additional processing to make different fibers behave as one fabric.

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This matters because it can combine:

• chemical treatments from processing

• synthetic fiber contact against the skin

• ongoing microfiber shedding

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This becomes more relevant in clothing worn directly against the body, such as:

• underwear

• bras

• socks

• t-shirts

• activewear

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Blended fabrics are not just a mix of materials. They are a more engineered system that brings multiple variables together in one fabric.

 

What to look for when choosing blended fabrics

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Start with what the fabric is actually made of:

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Check the material breakdown
Look at the percentages. A “cotton blend” can still be mostly synthetic

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Look at which fiber dominates
The highest percentage usually drives how the fabric behaves

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Be aware of added stretch fibers
Even small amounts of elastane or spandex increase how engineered the fabric becomes

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Watch for performance claims
Wrinkle-resistant, stretch, moisture-wicking, and stain-resistant fabrics usually involve additional processing

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Pay attention to skin contact
Blends matter more in underwear, bras, socks, and fitted clothing

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Understand the trade-off
Blends are often used for convenience, durability, or cost — not simplicity

 

Common labels explained

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Cotton Blend
A mix of cotton with synthetic fibers like polyester or elastane. The percentage matters more than the label.

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Poly-Cotton / Cotton-Poly
Different ways of saying cotton and polyester are combined. The order does not always reflect the exact ratio.

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Stretch Fabric
Usually indicates elastane or spandex has been added, even in small amounts.

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Performance Blend
A general term that often signals added treatments and more engineered fabric behavior.

 

Bottom Line

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Blended fabrics combine multiple materials into one system.

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The most important things to look at are which fibers are used, how much of each is present, and how the fabric is treated. When synthetic fibers are part of the blend, they bring chemical treatments, endocrine disruption related concerns, and microfiber shedding into the material.

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The more components and treatments involved, the further the fabric moves away from a simple material.