Women's Piper Keyhole 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. LSPACE Women's Piper Keyhole One-Piece Swimsuit carries a failing PFAS grade, and we never recommend buying a failing product.
Lspace
Women's Piper Keyhole One-Piece Swimsuit
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFormaldehyde resins (dye fixation or wrinkle resistance)
PossibleAzo dyes and color fastness
PossibleDegradation and microplastic shedding
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 Formaldehyde resins (dye fixation or wrinkle resistance), Azo dyes and color fastness and Degradation and microplastic shedding on the Lspace and not on the Patagonia.
- We flag Elastane (spandex) degradation under heat or chlorine on the Patagonia and not on the Lspace.
- The Lspace is nylon/polyester blend (standard swimwear) where the Patagonia is Nylon/polyester blend with elastane (standard swimwear), which is most of the difference in these two grades.
- The gap is 25 points, wide enough that this is not a close call, and the Patagonia is the one to buy.
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