lululemon Shorts | Men's Swim Short Lined 5" | Size M

water-repellent coating chemical coating (PFAS risk)

Nylon blend swim shorts almost certainly carry a water-repellent coating treatment to achieve water repellency. Lululemon does not disclose the chemistry or PFAS status; legacy and current water-repellent coating formulations often contain PFOA, GenX, or other long-chain PFAS. This is the dominant chemical hazard for this product type.

Formaldehyde resins (finish treatment)

Nylon textiles may contain formaldehyde-based resins used for wrinkle resistance or durability finishing. No evidence of this in Lululemon shorts specifically, but the material class and lack of disclosure mean it cannot be ruled out. Wash before first wear to reduce residual exposure if present.

Azo dyes or heavy metals in pigments

No recalls or reports of restricted azo dyes or toxic pigments in Lululemon shorts. Nylon readily accepts synthetic dyes, and major apparel brands typically avoid banned azo dyes, but without test data or certification, baseline risk remains unverified.

Antimony in polyester blend

If the nylon blend includes polyester content, antimony trioxide (used as a catalyst in polyester synthesis) could be present in trace amounts. This is not specific to Lululemon; it is a known polyester residue that is generally low-risk in worn apparel but higher if the fabric is heated or degraded.

Microplastic shedding during washing

Synthetic nylon shorts will shed microfibers in the wash, though the extent depends on fabric construction and degradation over time. This is a known concern for all synthetic athletic wear; washing in a microfiber-filter laundry bag reduces environmental release but does not affect wearer safety.