Core Daily Wrapped Liners vs Speax by Thinx Thong Incontinence Underwear Women for: which is safer?
Kotex Core Daily Wrapped Liners is the clear pick. Speax by Thinx Thong Incontinence Underwear Women for carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Kotex
Core Daily Wrapped Liners
PFAS grade
Good 70/100
Overall grade
Poor 48/100
Verdict
Buy
Hazard flags
⚑ 4
Material
cotton, rayon, adhesive (nonwoven blend)
Confidence
72%
PossibleSynthetic adhesive leachables
ReportedFragrance allergens (if scented variant)
PossibleMicroplastic shedding from nonwoven backing
Thinx
Speax by Thinx Thong Incontinence Underwear Women for
PFAS grade
Poor 25/100
Overall grade
analysis pending
Verdict
pending
Hazard flags
none flagged
Material
Moisture-wicking synthetic blend with unspecified waterproof/absorbent coating
Confidence
42%
Where these two actually differ
- We flag Synthetic adhesive leachables, Fragrance allergens (if scented variant), Microplastic shedding from nonwoven backing and PFAS water-resistance coating (undisclosed) on the Kotex and not on the Thinx.
- The Kotex is cotton, rayon, adhesive (nonwoven blend) where the Thinx is Moisture-wicking synthetic blend with unspecified waterproof/absorbent coating, which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Kotex is the one to buy.
- We are less certain about the Thinx 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 panty liners: see the full ranking