Fabric Labels Explained: What Cotton, Polyester, and Blends Mean for Your Clothes

Why Fabric Content Labels Actually Matter

Every garment sold in the United States is required by the Federal Trade Commission (FTC) to carry a fiber content label. That small tag sewn into a seam isn't just a nuisance — it's a roadmap to how a piece will feel against your skin, how long it will last, and how you need to care for it.

Once you know how to read it, you can shop with real confidence — whether you're browsing a thrift rack or checking a product page online. (Speaking of which, our guide to buying clothes online covers exactly what to look for before you commit to a purchase.)

The Major Fibers and What They Do

Cotton

Cotton is a natural fiber prized for breathability and softness. It absorbs moisture well, making it a go-to for warm-weather wear and activewear. On the downside, 100% cotton wrinkles easily, can shrink in the wash, and dries slowly when damp. Higher thread counts generally indicate a smoother, more durable weave.

Polyester

Polyester is a synthetic fiber engineered for durability and wrinkle resistance. It holds its shape, dries quickly, and resists shrinking — which is why it's common in athletic wear, workwear, and budget-friendly basics. Its main drawback is breathability: polyester traps heat and can feel clammy in warm conditions. It also tends to hold onto odors over time.

Rayon (Viscose)

Rayon is a semi-synthetic fiber made from processed plant cellulose. It drapes beautifully and feels silky, which makes it popular in flowy tops and dresses. However, it's one of the more delicate fibers — prone to shrinking, stretching, and weakening when wet, so it often requires hand washing or dry cleaning.

Nylon

Nylon is a strong, lightweight synthetic that resists abrasion exceptionally well. You'll find it in hosiery, activewear, and outerwear linings. Like polyester, it's not very breathable, but it adds resilience to any blend it's part of.

Spandex (Elastane or Lycra)

Spandex is almost never used alone — it's the stretch ingredient added in small amounts (usually 2–5%) to give a garment recovery and flexibility. Even a tiny percentage transforms the fit and movement of otherwise rigid fabrics.

Blends: Getting the Best of Multiple Fibers

A fabric blend combines two or more fibers to balance their strengths and offset their weaknesses. A classic example is a cotton-polyester blend — say, 60% cotton, 40% polyester. You get cotton's breathability and softness alongside polyester's durability and wrinkle resistance. These blends are workhorses in everyday wardrobes for good reason.

Here's a general pattern to keep in mind: the fiber listed first on the label is present in the highest percentage. So "65% polyester, 35% cotton" leans more synthetic than a "60% cotton, 40% polyester" garment, even though they contain the same two fibers.

Understanding fiber content also feeds directly into garment longevity. Fit and construction matter too — a well-fitting piece in a durable blend will outlast a poorly cut 100% cotton shirt every time. Our article on how fit transforms any garment digs into that side of the equation.

From Label to Laundry: What Fiber Content Means for Care

Fabric content is the single biggest factor in how you should wash, dry, and store a garment. High polyester content? Machine wash and tumble dry with confidence. High rayon or wool content? Check for a dry-clean-only tag before tossing it in. Even within blends, the minority fiber often sets the rules — a 90% cotton, 10% wool sweater still calls for gentle handling because of the wool.

For a deeper look at extending the life of everything in your closet, the guide to caring for your clothes walks through laundry habits, storage tips, and maintenance routines organized by fabric type.