Women's Bottom Turn Racerback Bikini Top vs Women's Collective MF Gathered WrapFront One Piece Swimwear: which is safer?
Patagonia Women's Bottom Turn Racerback Bikini Top is the clear pick. Seafolly Women's Collective MF Gathered WrapFront One Piece Swimwear carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Patagonia
Women's Bottom Turn Racerback Bikini Top
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleElastane (spandex) degradation under heat or chlorine
Seafolly
Women's Collective MF Gathered WrapFront One Piece Swimwear
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyPFAS in water-repellent finish
PossibleAzo dyes in polyamide
PossibleFormaldehyde resins (durable finish agents)
Where these two actually differ
- We flag Elastane (spandex) degradation under heat or chlorine on the Patagonia and not on the Seafolly.
- We flag PFAS in water-repellent finish, Azo dyes in polyamide, Formaldehyde resins (durable finish agents) and Microplastic shedding on the Seafolly and not on the Patagonia.
- The Patagonia is Nylon/polyester blend with elastane (standard swimwear) where the Seafolly is Nylon/polyamide blend with water-repellent treatment, which is most of the difference in these two grades.
- The gap is 70 points, wide enough that this is not a close call, and the Patagonia is the one to buy.
- We are less certain about the Seafolly grade, at 45% confidence against 72%, because it discloses less.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More swimwear: see the full ranking