What's Really in Your Bed Sheets?

A better way to think about textile ingredients

Think about the last time you washed a new set of sheets and noticed a strange smell. That faint chemical edge that takes a few washes to fade. Most people assume it's just "newness." But it's worth asking what, exactly, is washing out — and what might still be there.

TL;DR

"100% cotton" is a fiber label — not an ingredient list. What goes into your fabric before it reaches you matters just as much as the fiber itself. Here's how to start reading between the lines.

The gap no one talks about

You already read labels in other parts of your life. In food, you check ingredients. In skincare, you check ingredients. You've learned that "natural" doesn't mean safe, and that what's left out of a product matters as much as what's in it.

But in textiles? You don't get that same visibility.

✓ What you usually see

→ Fiber content (e.g. 100% cotton)

✗ What you don't see

→ What dyed it
→ What treated it
→ What finishing chemicals were applied
→ What it was exposed to during processing

This creates a blind spot. Two products can look identical on the surface — same thread count, same price, same fiber — while being completely different in how they were made and what remains in the fabric.

A different way to think about it

"100% cotton" is not an ingredient list. It tells you what the fiber is. But it tells you nothing about what's been done to it.

Textiles do have ingredients. They're just not disclosed. Every fabric goes through a series of steps before it reaches you:

Growing or producing the fiber
Processing and cleaning it
Dyeing it
Finishing it

At each stage, something can be added. And those additions don't simply disappear at the point of sale.

Here's what that means in practice: your skin doesn't just interact with "cotton." It interacts with everything that was done to cotton. The dyes. The residues from processing. The finishes applied to achieve softness, wrinkle resistance, or brightness.

This isn't speculation. A 2019 peer-reviewed review on textile contact dermatitis published in Current Treatment Options in Allergy put it plainly:

"The textile fibres as such are rarely the causative agent. Allergic contact dermatitis… is primarily caused by substances that are used to give the material certain qualities or performances."¹

In other words: it's not the cotton that irritates your skin. It's what was added to the cotton. For most people, this exposure is low-level and cumulative — which is precisely why it tends to go unnoticed for so long.

What touches your skin — the hidden journey of a cotton sheet

Raw fiber

The cotton itself — before anything is done to it

↓

Processing & cleaning

Bleaches and scouring agents to whiten and soften the raw fiber

↓

Dyeing

Synthetic or natural dyes, often with mordants to fix colour

↓

Finishing

Softeners, wrinkle-resistance treatments, optical brighteners

↓

→

What actually touches your skin

All of the above — the fiber and everything added to it

What a real textile ingredient list would look like

If textiles followed the same transparency standards as food or skincare, labels would look very different. A meaningful ingredient list would include:

→ Fiber source — not just "cotton," but where and how it was grown
→ Dye source — synthetic or plant-based, including what pigments were used
→ Finishing processes — what treatments were applied, and why
→ All added substances — anything introduced during processing
→ What is explicitly not used — clear exclusions, not assumptions

This kind of disclosure doesn't just inform. It changes how you evaluate a product entirely.

Here's what a transparent textile breakdown can look like in practice:

Materials & inputs

Cotton Indian Highland Long Staple cotton

Dye Indigofera tinctoria — plant-based indigo pigment used for centuries

Threads Organic cotton

What is not used

Synthetic dyes Many contain azo compounds linked to skin sensitisation

Polyester blends Not used in any component

Chemical finishes No wrinkle-resistance, optical brighteners, or antimicrobial treatments

ℹ What you can do: three questions to ask before you buy

Instead of asking "What is this made of?" — try these:

What was used to dye it?

Look for plant-based or low-impact dyes. If the brand doesn't mention it, that's informative in itself.

Was it chemically finished?

Common finishes include wrinkle resistance (often formaldehyde-based) and optical brighteners. Look for OEKO-TEX or GOTS certification on the label, or ask the brand directly.

What is explicitly excluded?

Any brand confident in its process will list what it doesn't use. The absence of this information is itself worth noting.

These questions won't always produce clear answers. But asking them puts you in a different position as a consumer — one that goes beyond the label and into real understanding.

Transparency is the first step. But it raises a new question: even if you know what goes into a textile, how do you know it actually performs the way it should?

Next, we look at what certifications actually verify — and which ones don't. Because knowing the ingredients is one thing. Knowing they hold up is another.

¹ Malinauskiene, L. & Zimerson, E. "Textile Contact Dermatitis: How Fabrics Can Induce Dermatitis." Current Treatment Options in Allergy, 2019. link.springer.com/article/10.1007/s40521-019-0197-5