PFAS score
Sierra · Camping Tents & Tarps
Sierra Designs Fern Canyon 4 Tent
Skip unless Sierra discloses water-repellent coating chemistry, waterproof tents commonly use PFAS-based treatments.
The Fern Canyon 4 is a polyester tent with water-repellent coating typical of outdoor gear. Sierra does not publicly disclose the water-repellent coating treatment chemistry. Because most tent waterproofing historically relies on fluorinated compounds, purchasing without brand transparency on PFAS status carries elevated uncertainty.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Polyester tent fabric with water-repellent coating (water-repellent coating) coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More camping tents & tarps grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.