Basic Mid-Rise Period Brief vs Thinx Teens Bikini Leakproof Period Underwear - Black: which is safer?
Modibodi Basic Mid-Rise Period Brief is the clear pick. Thinx Teens Bikini Leakproof Period Underwear - Black carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Modibodi
Basic Mid-Rise Period Brief
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleWater-resistant coating degradation
PossibleMicrobial growth and odor with improper care
Proof
Thinx Teens Bikini Leakproof Period Underwear - Black
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyCoating degradation and particle shedding
PossibleFormaldehyde in textile finishing resins
PossibleAzo dyes in black fabric
Where these two actually differ
- We flag Water-resistant coating degradation and Microbial growth and odor with improper care on the Modibodi and not on the Proof.
- We flag Coating degradation and particle shedding, Formaldehyde in textile finishing resins, Azo dyes in black fabric and Allergen irritation from undisclosed additives on the Proof and not on the Modibodi.
- The Modibodi is organic cotton blend with water-resistant coating where the Proof is Gusseted cotton-blend fabric with water-resistant coating, 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 Modibodi is the one to buy.
- We are less certain about the Proof grade, at 42% confidence against 85%, 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