Is nylon bad for your skin?

Nylon shares many of the same skin-related concerns as polyester because it is also a petroleum-derived synthetic plastic. Like polyester, nylon does not breathe well, traps moisture and heat, and creates conditions that promote bacterial growth and skin irritation. Nylon is commonly used in activewear, underwear, swimwear, and hosiery—garments that sit directly against sensitive skin for extended periods.

During nylon production, the fiber is treated with a range of chemicals including bleaching agents, softeners, and dyes. Some nylon garments contain residual caprolactam, a chemical used in nylon synthesis that is a known skin and eye irritant. Additionally, nylon is one of the most significant sources of textile microplastic shedding, releasing plastic microfibers both during washing and through friction against the skin during wear.

For garments that sit close to the body, switching from nylon to natural alternatives can make a noticeable difference in skin comfort. Tencel and merino wool both offer the stretch, softness, and moisture-wicking properties that nylon is prized for, without the petrochemical baggage. Icebreaker uses merino wool for base layers and activewear that naturally regulate temperature and resist odor, while Boody makes underwear and basics from bamboo-derived fabric that is gentle enough for the most sensitive skin.