Women's Billabong Paradise Sun Tully Strapless 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. Women's Billabong Paradise Sun Tully Strapless One-Piece Swimsuit carries a failing PFAS grade, and we never recommend buying a failing product.
Billabong
Women's Billabong Paradise Sun Tully Strapless One-Piece Swimsuit
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
Likelywater-repellent coating (water-repellent coating) coating chemistry
PossibleAzo dyes and reactive dyes in fabric coloring
PossibleMicrofiber shedding from worn material
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 Durable Water Repellent (DWR) coating chemistry, Azo dyes and reactive dyes in fabric coloring and Microfiber shedding from worn material 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 Nylon/polyester blend with durable water repellent (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 42% 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