GOTS certifies organic cotton from the farm through every processing stage. GREENGUARD Gold puts the finished, assembled item in a sealed chamber and measures what it releases into the air. A pillow can hold both certificates or only one, depending on what it is made from and how it is constructed.
GOTS follows the fiber through spinning, weaving, dyeing, cutting and sewing. Every facility along that chain holds its own certificate and must comply with chemical restrictions, wastewater treatment requirements, and labor standards built on International Labour Organization conventions. The certification prohibits chlorine bleaching, formaldehyde, carcinogenic azo dyes, and toxic heavy metals. It bans glyoxal alongside formaldehyde, which closes the substitution route mills use when they want a wrinkle-resistant finish without the word formaldehyde appearing on the paperwork.
What GOTS never measures is what comes out of the product into the air over weeks in a bedroom. GREENGUARD Gold screens 360 or more volatile organic compounds, sets a formaldehyde threshold of 9 micrograms per cubic meter, and holds total VOCs under 220 micrograms per cubic meter. It requires compliance with California Department of Public Health Standard Method version 1.2, the emissions test schools and healthcare buildings rely on. GOTS tests the material. GREENGUARD tests the air.
A product with adhesive, foam, or a barrier film can carry GOTS Certified Organic status for its cotton face and still release measurable VOCs from the synthetic layer GOTS does not test. The waterproof pillow protector is the clearest example. It holds GOTS-10229 for its organic cotton face and GREENGUARD Gold for the polyurethane barrier film, because a barrier is where off-gassing would come from. The cotton passed one standard. The assembled protector passed the other.
A loose fiber fill inside a woven cotton cover has very little to give off, which is why pillows and duvets rarely carry GREENGUARD and do not need it. A mattress with foam and adhesive earns the label. The distinction is bulk and assembly. The more layers and synthetic inputs a product holds, the wider the gap between what GOTS can certify and what GREENGUARD will measure. One traces the supply chain. The other seals the product in a chamber and counts what escapes.
Originally published on [Circadian](https://circadianrest.com/blogs/pillow-talk/gots-vs-oeko-tex-vs-greenguard-which-trust).
