Women's Bottom Turn Racerback Bikini Top vs Women's Long Sleeve Zip Front One-Piece Swimsuit: which is safer?
Patagonia Women's Bottom Turn Racerback Bikini Top is the clear pick. Seafolly Women's Long Sleeve Zip Front One-Piece Swimsuit 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 Long Sleeve Zip Front One-Piece Swimsuit
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyPFAS in water-repellent coating
PossibleAzo dyes in polyester/nylon blend
PossibleFormaldehyde resins in fabric finishing
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 DWR coating, Azo dyes in polyester/nylon blend, Formaldehyde resins in fabric finishing and Microplastic shedding from coating or fibers on the Seafolly and not on the Patagonia.
- The Patagonia is Nylon/polyester blend with elastane (standard swimwear) where the Seafolly is Nylon/polyester blend with DWR finish, 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