Leakproof Period Underwear - Thong Style Essential Thong Black / XL vs Rubylove First Period Kit +teen Period Underwear: which is safer?
Rubylove First Period Kit +teen Period Underwear is the clear pick. Aisle Leakproof Period Underwear - Thong Style Essential Thong Black / XL carries a failing PFAS grade, and we never recommend buying a failing product.
Aisle
Leakproof Period Underwear - Thong Style Essential Thong Black / XL
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleWaterproof coating composition (undisclosed)
PossibleSpandex and nylon degradation byproducts
PossibleMicroplastic shedding from synthetic blend
Our pick
Ruby Love
Rubylove First Period Kit +teen Period Underwear
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleCoating degradation and microparticle shedding
PossibleBacterial or fungal growth if improperly stored
Where these two actually differ
- We flag Waterproof coating composition (undisclosed), Spandex and nylon degradation byproducts and Microplastic shedding from synthetic blend on the Aisle and not on the Ruby Love.
- We flag Coating degradation and microparticle shedding and Bacterial or fungal growth if improperly stored on the Ruby Love and not on the Aisle.
- The Aisle is nylon/spandex blend with undisclosed waterproof coating where the Ruby Love is organic cotton, waterproof backing layer, which is most of the difference in these two grades.
- The gap is 75 points, wide enough that this is not a close call, and the Ruby Love is the one to buy.
- We are less certain about the Aisle grade, at 35% confidence against 82%, 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 period underwear: see the full ranking