Our Standards

Materials & Certifications

Most school uniforms are made from polyester, a synthetic fiber that traps heat and moisture against a child's skin for hours at a time. Positive Thread is the premium alternative: the only school uniform brand built on natural fibers from the ground up, with GOTS-certified organic cotton at the foundation.

Our MaterialsCertifications
Positive Thread uniform out in the world
Kiko, the Positive Thread buddy

Why fabric matters

A standard that has not existed in this category until now.

If your child has ever tugged at their collar, resisted getting dressed, or come home uncomfortable after a long day, you have already seen how much fabric matters. We started from the fiber up.

Our Materials

Clean before a single thread is spun.

A natural fiber selected for long school days, close skin contact, and everyday comfort.

What it is

Grown without synthetic pesticides, fertilizers, or genetically modified seeds. Organic cotton farming uses up to 91% less water than conventional cultivation, because organic soil holds moisture naturally and most organic cotton is rain-fed rather than irrigated.

Why it starts at the farm

Conventional cotton is among the most chemically intensive crops in the world. Certified organic farming removes those inputs from the beginning of the supply chain, before a single thread is spun.

Why certification matters beyond the farm

GOTS standards govern not just the fiber but every stage of the supply chain, including spinning, dyeing, and processing, ensuring that what begins clean stays clean. Certified facilities are independently inspected annually.

A smooth, plant-derived fiber that moves moisture away from the skin rather than trapping it.

What it is

Produced by Lenzing AG from sustainably sourced eucalyptus wood pulp in a closed-loop process that recovers and recycles over 99% of the water and solvents used. Biodegradable. Does not shed microplastic fibers during wear or washing.

How it behaves on the body over time

A child wears their uniform through heat, movement, and long days. TENCEL is naturally smooth, naturally antimicrobial, and exceptionally moisture-wicking, moving perspiration away from the body. In warm climates and during active school days, that difference is felt.

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A note on our organic cotton fleece

Our crewneck and quarter zip sweatshirts are made from organic cotton fleece. This deserves its own moment because it is genuinely rare.

Almost every school uniform sweatshirt on the market is made from polyester fleece. Organic cotton fleece in uniform-appropriate colors like navy, white, and grey essentially does not exist in the school uniform market. We built our sweatshirts around it anyway, because we believe the garment a child reaches for most on a cold morning should be the cleanest one they own.

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Full transparency

We tell you exactly what is in every garment.

A note on our less than 3% spandex
What it is and why it is there

Our shorts and skort include a small amount of spandex, less than 3%, because children need to move. Running, bending, sitting cross-legged on the floor. A uniform that restricts movement is not serving the child wearing it, and comfort was never a secondary consideration for us.

Why we are talking about it

GOTS permits up to 5% synthetic fiber for functional purposes like elasticity. We keep ours below 3% and use it only where it genuinely supports the fit and freedom of movement children deserve throughout their school day. Synthetic fiber appears nowhere else in our collection.

When the industry catches up

We know the industry has not yet found a perfect natural alternative that delivers the same ease of movement. When it does, we will be the first to make the switch. Until then, we will always tell you exactly what is in every garment we make, and why.

Our shorts and skort are made from an organic cotton and TENCEL lyocell blend, independently tested for over 100 harmful substances at the strictest tier, the standard reserved for articles worn in direct contact with the skin of babies and young children.
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What We Avoid

The substances that never enter our materials.

Choosing organic fiber from the start means the most chemically intensive parts of the textile supply chain are avoided before they ever begin.

PFASPhthalatesFormaldehydeToxic dyesPesticidesHeavy metalsAromatic solventsMicroplastic sheddingSynthetic fabrics

Our Certifications

Two standards answer two different questions.

GOTS: Global Organic Textile Standard

GOTS: Global Organic Textile Standard

The leading international certification for organic textiles. Recognized in over 70 countries, GOTS is the only standard that governs the entire supply chain from farm to finished product.

What it requires
  • Minimum 95% certified organic fibers for products labeled organic
  • Complete ban on synthetic pesticides and GMO seeds in farming
  • Prohibition of toxic dyes, formaldehyde, heavy metals, and aromatic solvents
  • Prohibition of phthalate-based plasticizers in printing processes
  • Mandatory wastewater treatment at production facilities
  • Annual third-party on-site inspections and laboratory testing
OEKO-TEX Standard 100

OEKO-TEX Standard 100

Tests the finished textile product for over 100 harmful substances, including heavy metals, formaldehyde, pesticides, phthalates, azo dyes, and PFAS. It verifies that what actually touches your child's skin has been independently tested and confirmed within established safety thresholds.

What it tests for
  • Heavy metals and formaldehyde
  • Pesticide residues
  • Phthalates and azo dyes
  • PFAS
  • Range of additional regulated substances
  • Class I standard for direct skin contact with babies and young children
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Material choice is the standard.
Certification confirms it.

Some school uniform vendors carry OEKO-TEX Standard 100 certification, which is meaningful finished-product verification. But OEKO-TEX tests for what is present. It cannot change what a material is. Synthetic fabrics that pass a finished-product test still shed microplastics, trap heat and moisture, and carry the inherent properties of petroleum-derived fibers while organic natural fibers do not.

GOTS governs what goes into the supply chain from the beginning. OEKO-TEX verifies what remains in the finished product at the end. Together they address both questions: what is this garment made of, and what does it contain.

No major school uniform vendor in the United States has built their entire product line on GOTS-certified organic fiber. At Positive Thread, we have built our entire collection around both standards.

Our polos and sweatshirts are made with GOTS certified organic cotton. Our shorts and skort are made with GOTS certified organic cotton blended with TENCEL lyocell, with less than 3% spandex for ease of movement. Every fabric we use is independently tested for harmful substances at the strictest tier, the standard reserved for articles worn against the skin of babies and young children. There is no polyester in any of it.

That is why certification alone is not the standard we built to.
Material choice is.

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Questions about materials?

For questions about our materials or certifications: wecare@positivethread.com