T-Shirt Sustainability
The humble cotton tee is one of the most-produced garments on earth, so how it is made matters. This hub explains the responsible fibres, recognised certifications and practices that lower a tee's footprint -- and how to read past the marketing.
Responsible fibres
Organic Cotton
Cotton grown without synthetic pesticides or fertilisers, protecting soil, water and farm workers.
Why it helps
Organic farming avoids the heavy agrochemical load of conventional cotton and often builds healthier soil.
On the label
Trust a recognised certification over the word alone. See the organic cotton glossary entry (/pages/glossary-organic-cotton).
Recycled Cotton
Cotton reclaimed from offcuts or old garments, cutting the water and land needed for new fibre.
Why it helps
Reusing existing cotton avoids the resource cost of growing virgin fibre and diverts textile waste.
Trade-off
Recycled fibres are shorter, so recycled cotton is usually blended with virgin fibre for strength.
Recycled Polyester
Polyester made from reclaimed plastic, chiefly bottles, reducing reliance on virgin petroleum.
Why it helps
It keeps plastic in use and lowers the footprint versus new polyester, common in performance tees.
Look for
A GRS (Global Recycled Standard) claim verifies the recycled content -- see certifications below.
Hemp and Linen
Fast-growing plant fibres that need little water and few chemicals, and are fully biodegradable.
Why they help
Hemp and flax (linen) grow with minimal irrigation and pesticide, and break down naturally at end of life.
Wear benefit
Both are breathable and durable, softening with age -- a genuinely low-impact summer choice.
Lyocell (TENCEL)
A wood-pulp fibre made in a closed-loop process that recaptures almost all of its solvent.
Why it helps
The closed-loop system recycles the chemicals used, and the wood is typically from certified forests.
Wear benefit
Lyocell is soft, breathable and drapes beautifully, adding a premium feel to responsible tees.
Certifications and standards
GOTS (Organic Standard)
The leading certification for organic textiles, covering fibre, processing and social criteria.
What it verifies
GOTS certifies organic fibre content and sets environmental and labour standards through the whole supply chain.
Why trust it
It is independently audited, so a GOTS label means far more than the unregulated word 'organic'.
OEKO-TEX Standard 100
A certification confirming a textile has been tested for harmful substances and is safe for skin.
What it verifies
Every component is tested against a list of regulated and harmful chemicals. See the OEKO-TEX glossary entry.
Why it matters
It is about safety and chemical management rather than carbon, and reassures on what touches your skin.
GRS and Better Cotton
Two widely used standards: GRS verifies recycled content; Better Cotton improves conventional cotton farming.
GRS
The Global Recycled Standard traces and verifies recycled material claims through the supply chain.
Better Cotton
The Better Cotton Initiative trains farmers in more sustainable practices, though it is a mass-balance system rather than physical traceability.
Impact and practice
Water Consumption
Cotton is thirsty, so water use is one of a tee's biggest impacts and a key reason to choose responsible fibres.
The issue
Conventional cotton can demand large volumes of irrigation. Organic, recycled and rain-fed fibres ease the burden.
What helps
Efficient dyeing and finishing also cut water use significantly, which is why responsible mills matter.
Circular Fashion
Designing and buying tees to last, be repaired and eventually be recycled rather than binned.
The idea
Circularity keeps materials in use: durable construction, timeless design and, at end of life, recycling into new fibre.
Your part
Buying fewer, better tees and caring for them well -- see the care hub (/pages/tshirt-care) -- is the most effective step most of us can take.
Frequently asked questions
Is organic cotton really better for the environment?
Grown without synthetic pesticides and fertilisers, certified organic cotton reduces chemical load and often water use. Look for a GOTS certification rather than the word 'organic' alone.
What does recycled polyester mean on a t-shirt?
The polyester is made from reclaimed plastic, usually bottles, rather than virgin petroleum. A GRS label verifies the recycled content claim.
Which certifications should I look for in a sustainable tee?
GOTS for organic content, GRS for recycled content, and OEKO-TEX Standard 100 for freedom from harmful substances are the most trustworthy, independently audited marks.