A Greenpeace report has found that several major sportswear brands—including Adidas, Nike, and Puma—contain polyfluorinated chemicals (PFCs), nonylphenol ethoxylates (NPEs), and phthalates. All of these chemicals are linked to major health issues. PFCs, which make items stain-proof, are linked to problems like low birth weight and prostate cancer; phthalates are linked to attention deficit disorder, asthma, breast cancer, obesity, and behavioral and neurodevelopmental issues; and NPEs degrade into hormone-disrupting chemicals.
Experts advise that consumers avoid clothing that is crease-free, moth-repellant, stain-resistant, or fire-retardant, as these properties are typically achieved by using the above-mentioned toxic chemicals. In workout clothes, screen-printing and plastic prints are an indication of the presence of phthalates. Natural and organic fabrics like silk, cotton, and wool are the safest choice, as they are naturally antimicrobial and antibacterial and good at thermal regulation.