The Plastic-Free School PE Kit
“Compulsory PE, five days a week, through the growth window. Polyester, elastane, and a fluorine coating nobody discloses — pressed against your child's thinner, more permeable skin, in heat, sweat, and friction.”
The Problem
Children's skin is thinner than adult skin. Under heat, moisture, friction, occlusion, and stretch — all five at once — short-chain PFAS crossed reconstructed human skin at 58.9% in twenty-four hours. Pregnant mothers transfer the same compounds to the foetus at rates between 97% and 146%. The exposure window is the growth window.
School PE is the only activity in a child's week that stacks all five skin-penetration enhancers at the same time. Two lessons in term, plus after-school club, plus weekend fixtures — the kit sits against the warmest, most permeable skin on their body for four to seven hours every week, for ten school years.
Polyester shirt. Polyester-elastane shorts with a fluorine-based coating on the outer face. Nylon-elastane swim costume with chlorine-resistance chemistry the brand won't describe. Polyester sock with a silver biocide. The "organic cotton" PE polo from the picket-fence brand? Read the label at home: 94% cotton, 6% elastane. Elastane is a polyurethane. It hydrolyses against skin at body temperature and releases aromatic amines.
The Gap
We looked at every UK retailer selling children's activewear. The mainstream is polyester-elastane. The organic-cotton brands are elastane-trapped or won't tell you what's in the waistband. No UK shop sells a 100% merino children's football jersey. No UK shop sells a natural-fibre children's swim kit without lycra or undisclosed chemistry. The pre-1975 British school kit worked for a century. Nobody has restocked it.
What Should Exist
One kit. Six garments. Every component declared on the page before you buy it.
- Open-weave cellular cotton polo — 100% organic cotton, coconut or wood buttons, water-based logo ink.
- Cotton drill shorts — drawstring waist, no elastane, no fluorine coating.
- Merino football jersey — 100% wool, no polyester mesh, no water-repellent finish.
- Wool swim costume or natural-rubber-laminated cotton trunks — no nylon, no elastane, no chlorine-resistance chemistry.
- Merino leggings and base layer — ribbed-knit waistband and cuffs, no polyurethane.
- Merino PE sock — natural rubber cuff encased in cotton, no silver.
The Honest Position
Natural fibres dry slower than polyester. For school PE — indoor lessons, weekend drying window — that doesn't matter. For children training at competitive-league intensity six days a week, it might. This is premium kit; it costs more than £3 supermarket polyester. And yes, wool swim costumes read as Victorian at first glance. The 1920s–50s wool costume was the global standard for half a century. It worked. Wool handles chlorine better than nylon ever has.
The Investigation: The Second Skin — how short-chain PFAS in children's activewear cross skin under the five conditions school PE delivers.