Cotton Decision Guide
Cotton is one of the most common materials used in clothing, bedding, and textiles that stay in direct contact with your skin for long periods of time. The main difference between cotton types is how it is grown and how it is treated before it becomes fabric.
Organic Cotton
Best overall option
Organic Cotton
Best overall option
The cleanest cotton option because it lowers both agricultural chemical exposure and the load of added treatments on the fabric.
Untreated or Better-Sourced Cotton
Good option with fewer added treatments
Untreated or Better-Sourced Cotton
Good option with fewer added treatments
A practical step down from organic cotton, especially when the fabric is simple and avoids heavy treatments.
Conventional Cotton
Common, but can carry more chemical treatment
Conventional Cotton
Common, but can carry more chemical treatment
Better than synthetic fabric from a microplastic standpoint, but still often processed with chemicals that matter for daily skin contact.
Heavily Treated Cotton or Cotton Blends
Worst option
Heavily Treated Cotton or Cotton Blends
Worst option
The least ideal category because it combines cotton with more treatments and often synthetic material, increasing what can sit against skin day after day.
How to think about cotton
With cotton, the key question is simple:
👉 What is left in the fabric that sits against your skin?
In practical terms, focus on:
- How the cotton is grown
- How it is processed and finished
- Whether chemicals are added after production
- How often you are wearing or using it
Unlike food or water, exposure here is primarily through skin contact over time.
Where exposure comes from
Exposure with cotton comes from two main stages: growing and processing.
Conventional cotton farming often uses large amounts of pesticides and herbicides.
Common examples include:
- Glyphosate
- Organophosphate pesticides
- Insecticides used during cultivation
Residues from these can remain in the fibers.
After harvesting, cotton is processed into fabric. This is where another layer of exposure can be introduced. Common processing chemicals include:
- Formaldehyde resins (used for wrinkle resistance)
- Dyes and finishing agents
- Bleaching chemicals
- Stain-resistant coatings (sometimes PFAS-based)
These treatments are designed to change how the fabric looks or performs, but they also determine what comes into contact with your skin.
Because cotton is worn daily and often for long periods, this creates continuous, low-level skin exposure.
What to look for when choosing cotton
You don’t need to replace everything at once. Focus on reducing the biggest sources of exposure.
Choose organic cotton when possible
Reduces exposure to pesticides and herbicides used during growing
Look for GOTS certification when available
Helps ensure the cotton is organic and limits harmful processing chemicals like formaldehyde and certain dyes
Prioritize untreated or minimally treated fabrics
Avoids added finishes like wrinkle-resistant or stain-resistant coatings
Be cautious with “performance” cotton
These often include chemical treatments or synthetic blends
Wash new items before use
Helps remove surface-level residues from manufacturing
Small changes here can reduce what your skin is exposed to every day.
Common labels explained
Organic Cotton
Grown without synthetic pesticides or herbicides, but does not always address processing chemicals.
GOTS Certified (Global Organic Textile Standard)
Covers both how cotton is grown and how it is processed, limiting the use of certain chemicals and finishes.
Wrinkle-Resistant / Stain-Resistant
Indicates added chemical treatments, often including formaldehyde resins or coatings.
Bottom Line
Cotton is a daily skin contact exposure point. Conventional and heavily treated cotton can introduce multiple inputs at once, including pesticide residues like glyphosate, formaldehyde-based finishes, dyes, and stain-resistant coatings.
With repeated use, this can contribute to:
- Skin irritation
- Low-level chemical exposure over time
- Overall increased toxic load
Better options like organic cotton and GOTS-certified textiles reduce both how the cotton is grown and how it is treated before it reaches you.
The goal is to choose fabrics that limit what sits against your skin every day.