Rubylove First Period Kit +teen Period Underwear vs Make The Switch Set Period Underwear: which is safer?
Rubylove First Period Kit +teen Period Underwear is the clear pick. Thinx Make The Switch Set Period Underwear carries a failing PFAS grade, and we never recommend buying a failing product.
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
Thinx
Make The Switch Set Period Underwear
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyPFAS in waterproof coating (fluorochemicals)
PossibleMicroplastic shedding from synthetic coating
PossibleFormaldehyde in fabric finishing resins
Where these two actually differ
- We flag Coating degradation and microparticle shedding and Bacterial or fungal growth if improperly stored on the Ruby Love and not on the Thinx.
- We flag PFAS in waterproof coating (fluorochemicals), Microplastic shedding from synthetic coating, Formaldehyde in fabric finishing resins and Coating degradation and leachate into body on the Thinx and not on the Ruby Love.
- The Ruby Love is organic cotton, waterproof backing layer where the Thinx is Cotton/synthetic blend with waterproof coating (composition unspecified), 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 Thinx grade, at 45% confidence against 82%, because it discloses less.
Both products run through the same public rubric, which covers 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