Women's Stay Grounded Tanker One Piece Swimsuit vs Women's Bottom Turn Racerback Bikini Top: which is safer?
Patagonia Women's Bottom Turn Racerback Bikini Top is the clear pick. Billabong Women's Stay Grounded Tanker One Piece Swimsuit carries a failing PFAS grade, and we never recommend buying a failing product.
Billabong
Women's Stay Grounded Tanker One Piece Swimsuit
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyPFAS in water-repellent coating finish (Fluorinated Water Repellents)
PossibleMicroplastics from coating degradation
PossibleVOC off-gassing from finish application
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
Where these two actually differ
- We flag PFAS in DWR finish (Fluorinated Water Repellents), Microplastics from coating degradation, VOC off-gassing from finish application and Nylon degradation under UV and chlorine on the Billabong and not on the Patagonia.
- We flag Elastane (spandex) degradation under heat or chlorine on the Patagonia and not on the Billabong.
- The Billabong is Polyester/nylon blend with DWR finish where the Patagonia is Nylon/polyester blend with elastane (standard swimwear), 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 Billabong 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