Aisle Leakproof Thong Period Underwear
A water-repellent or grease-resistant treatment of unstated chemistry, with a brand PFAS statement we have not verified.
Aisle says its leakproof layers have no PFAS and that SGS testing found no detectable PFAS. We record that as an unverified brand claim. Mamavation reported no fluorine detected in Aisle (formerly Lunapads) period underwear. Its record describes a water-repellent or grease-resistant treatment of unstated chemistry, which is still counted.
Brand says: “Aisle says its leakproof layers have no PFAS and that SGS testing found no detectable PFAS.”
We flunk more products than we pass. This one earned its grade. How we grade
Material
Fabric blend with waterproof/leak-resistant coating (type unspecified)
Brand disclosure
Brand claims PFAS-free
Lab data
No PFAS found in testing
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What Aisle Leakproof Thong Period Underwear is made of, ingredients and materials
Aisle period underwear uses a fabric blend with an unspecified waterproof or leak-resistant coating, the chemistry of which the brand has not disclosed in publicly available materials. The coating is the functional element that prevents menstrual fluid from passing through to outer garments. Because the coating type is not named (e.g., polyurethane, silicone, or other polymer), full assessment of potential leachables or off-gassing is limited to what is known about common textile water-resistant treatments in this product class.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Coating degradation and functional loss
All fabric waterproof coatings degrade over time with laundering and use. No specific data on Aisle's coating durability exists in public records, but this is an inherent risk in all leak-resistant period underwear and a reason for periodic replacement.
Formaldehyde / VOCs
Fabric blends may use formaldehyde-based resins for wrinkle resistance or dye fixation. Aisle has not published testing or certification excluding formaldehyde; wear-in laundering typically reduces residual levels, but initial exposure is not ruled out by available information.
Source, ATSDR ↗Azo dyes and synthetic colorants
The unspecified fabric blend may be dyed with azo dyes or other synthetic colorants. No third-party dye certification (e.g., OEKO-TEX) is known to be held by Aisle for this product line, so potential allergen or toxicity risk from dyes cannot be excluded.
Unidentified coating leachables
The waterproof coating is chemically unspecified. If it is a polyurethane, silicone, or other synthetic polymer, potential leachates (plasticizers, catalysts, oligomers) exist but are not quantified in any public testing Aisle has disclosed. Risk is low under normal use but cannot be ruled out without chemical analysis.
What’s reassuring
Brand-stated PFAS-free
The brand states this product is PFAS-free. We have not verified the claim.
No PFAS found in lab test
No PFAS detected in independent testing.
Talc or mineral contamination in raw materials
No evidence of talc use in period underwear formulations exists in industry practice or Aisle's known sourcing. This hazard is not applicable to this product category.
How is this PFAS grade calculated?
The brand's record and disclosure
Aisle explicitly markets a PFAS-free stance, which aligns with growing category-wide moves away from PFAS "forever chemicals" in period products. The brand has not published detailed material transparency reports, ingredient lists for coatings, or third-party certifications (e.g., OEKO-TEX, bluesign) in widely available sources. Their PFAS claim remains unverified by independent testing disclosed publicly; reliance on the claim rests on brand assertion rather than published lab data.
How it compares in its category
Period underwear is a relatively new product category with variable transparency standards. Most competitors likewise do not disclose coating chemistry; some use polyurethane or silicone, others remain vague. Aisle's explicit PFAS-free positioning is more transparent than brands making no chemical claims, though fewer than half the category leaders publish independent material certifications. On disclosure, Aisle is mid-range; on stated PFAS avoidance, it is ahead of the category average.
If you buy it
Wash in cool to warm water (avoid hot water, which can degrade polymer coatings) and use mild detergent; avoid fabric softener and bleach, which compromise water-resistant finishes. Replace when the coating noticeably degrades, typically after 50-100 washes or if leakage occurs despite proper care. Do not tumble dry on high heat; air dry or low heat drying preserves coating integrity. Hand wash or delicate cycle is recommended to extend product lifespan.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- Independent test found none
- Brand statement
- Aisle has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Aisle Leakproof Thong Period Underwear?
- organic cotton, waterproof backing layer
- A third party reports verifying it as PFAS-free
- Coating degradation and microparticle shedding
2 hazards checked on this product, all on its full breakdown.
- organic cotton blend, water-resistant gusset
- The brand calls it PFAS-free, which we have not verified
- Microplastic shedding from water-resistant barrier
- Organic cotton, wood pulp fiber
- The brand calls it PFAS-free, which we have not verified
- Azo dyes and synthetic dyes
2 hazards checked on this product, all on its full breakdown.
More period underwear grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.