Do waterproof hiking boots contain PFAS?

Many waterproof hiking boots use PFAS-based DWR coatings on both the outer fabric and the interior membrane to repel water. Leather hiking boots may also be treated with PFAS-containing waterproofing sprays or creams. Since boots are worn for extended periods in conditions that promote sweating, PFAS can transfer to feet and be absorbed through the skin.

Feet are often overlooked as a route of chemical exposure, but the skin on feet is permeable, and the warm, moist environment inside a boot creates conditions favorable for chemical transfer. Hikers who wear PFAS-treated boots for multi-day trips accumulate significant foot-level exposure.

PFAS-free hiking boots are available from brands that use fluorine-free DWR or naturally water-resistant materials like waxed leather. Treating leather boots with beeswax-based waterproofing products provides effective water protection without fluorinated chemicals. When shopping for outdoor footwear, ask specifically about PFAS content and look for brands that have committed to fluorine-free production.