Tomi · Period Underwear
The High Waisted Period Microfiber For Medium Flows
Lower concern, but brand transparency on materials is absent.
Tomi's period underwear is microfiber-based and shows no public evidence of intentional PFAS-containing treatments like water-resistance or stain-resistant coatings. However, the brand provides no material disclosure or PFAS statements.
Shop Tomi on Amazon →Material
microfiber (synthetic polyester blend)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
This product is a polyester microfiber blend, a synthetic textile engineered for absorbency and moisture-wicking in period wear. Microfiber's fine synthetic fibers are prone to shedding microplastics during wear and washing, which is a particular concern for a garment in close contact with sensitive skin. The production process for polyester microfiber typically involves chemical finishes for water-repellency and absorbency; these finishing chemicals can include residual solvents, dyes, or antimicrobial coatings that may not be fully disclosed.
The brand's record and disclosure
Tomi has not published material transparency statements, safety certifications (such as OEKO-TEX or Global Organic Textile Standard), or public disclosure of dye sources, flame retardant use, or finishing chemicals on this product. No recalls or safety controversies specific to Tomi period wear are on record. The absence of proactive disclosure is a red flag in the personal-care textile category, where competitor brands increasingly publish third-party test results and chemical restrictions.
How it compares in its category
Period underwear made from organic cotton or certified microfiber (with published chemical restrictions) are more transparent alternatives, though they may cost more. Conventional microfiber period wear from larger brands often faces similar microplastic shedding concerns but more frequently disclose fiber content and finish standards. Tomi's positioning as a lower-cost option suggests fewer costly compliance or testing steps, which may correlate with less rigorous chemical management.
If you buy it
Wash separately in cold water and air-dry to minimize microfiber shedding and avoid heat damage to finishes; do not bleach or use fabric softeners, which can degrade synthetic coatings and increase leaching. Replace after 1-2 years or if elastic degrades, as aged microfiber sheds more readily. If you experience skin irritation, redness, or allergic reactions, discontinue use and rinse thoroughly before rewearing; this may indicate residual dyes or finishing chemicals.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Azo dyes and colorant residues
Microfiber textiles typically use acid or disperse dyes; Tomi's lack of dye-safety disclosure means no confirmation that azo dyes (which can release carcinogenic amines) are avoided or that excess dye has been properly rinsed. Skin contact with fugitive dye, especially in a moist environment, poses low-to-moderate risk.
Microplastic shedding
Microfiber by definition sheds fine synthetic particles during wear and washing. A garment worn against skin and laundered regularly will release microplastics into wastewater and potentially deposit fibers on skin; long-term dermal or systemic effects are not established but are under investigation.
Finishing chemical residues (water-repellents, antimicrobials)
Microfiber absorbency and moisture-wicking require chemical finishing, which may include dimethyl compounds, silicones, or antimicrobial agents. Tomi does not disclose these; residual or leachable finishing chemicals could irritate sensitive vulvar skin in contact with the garment.
Antimony in polyester
Antimony trioxide is a catalyst used in some polyester production; no recalls or warnings specific to Tomi period wear relate to antimony migration. Modern polyester production in regulated facilities typically binds antimony tightly, but Tomi's manufacturing sourcing is not publicly detailed.
Flame retardants
No public evidence that Tomi adds flame-retardant chemicals to this product. Microfiber apparel is not typically a regulatory target for flame retardants, but the absence of a public statement confirming non-use leaves this unconfirmed.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 62% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Period Underwear
JAMA Organic
LOLA Organic Cotton Period Underwear
Organic cotton with moisture-wicking gusset
Lower PFAS concern, organic cotton base with no waterproof claims, but brand doesn't explicitly address PFAS.
✓Verified PFAS-free by a third party
JAMA Organic
Organyc Certified Organic Cotton Disposable Period Underwear for Sensitive Skin
certified organic cotton with absorbent core
Lower concern, organic cotton base suggests minimal PFAS risk, but no explicit PFAS statement limits confidence.
✓Verified PFAS-free by a third party
Ruby Love
Women's Hipster Period Underwear
organic cotton with waterproof coating
Lower concern, PFAS-free verified; buy with confidence.
✓Lab test found no PFAS
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.