Are kids' clothes putting PFAS into their skin when they sweat?
Yes. Sweat speeds up PFAS moving from waterproof or stain-proof clothes into the skin.
What's actually in it
Stain-resistant pants, school uniforms, rain jackets, and athletic wear often have a PFAS coating to keep liquid from soaking in. Some of those clothes also use organophosphate flame retardants. Both stick to the fabric loosely and can rub off into skin and dust.
Sweat is mildly acidic and full of salt, which makes it a better solvent for these chemicals than plain water. Hot, active kids pull more out of the fabric than cool, sitting kids.
What the research says
A 2025 study in Sci Total Environ tested children's textiles in a sweat-mimic and showed that sweat amplified PFAS movement into the skin. The chemicals rubbed off into the sweat layer and then into a skin model. The mix of PFAS and flame retardants together did more harm in lab cells than either alone.
The team called clothes a real, daily skin source that's been overlooked next to food and water.
For school and play, pick untreated cotton, linen, or wool. Skip "stain-resistant" labels and outdoor coatings unless rain is the goal. Wash new clothes a few times before kids wear them to cut surface coatings.
The research at a glance
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