Period Underwear, ranked by PFAS safety
33 products graded from Bad to Excellent, safest first. 6 grade Good or better and are worth buying.
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The best non-toxic period underwear, ranked safest first
Buyer’s guide
What to look for in period underwear, and which brands grade best and worst
Bad · Better · Best period underwear
The quickest read, what to skip and the top-graded picks worth buying instead.
Thinx
Thinx for All Women's Comfort Brief Leakproof Period Underwear
Leakproof treatment unclear; brand silent on PFAS.
Lola
Organic Cotton Period Underwear
Lower concern. Organic cotton core, no water-resistant treatment disclosed.
Modibodi
Modibodi Basic Mid-Rise Period Brief
Lower concern. MADE SAFE certified, PFAS-free claimed and tested.
Worth buying Good or Excellent, safest first
Modibodi
Basic Mid-Rise Period Brief
organic cotton blend with water-resistant coating
Water-resistant coating degradation
Limited concern
Microbial growth and odor with improper care
Limited concern
Lower concern. MADE SAFE certified, PFAS-free claimed and tested.
✓Lab test found no PFAS
Lola
The Lola High Waist Period Underwear
organic cotton with water-resistant treatment
Water-resistant coating degradation and microplastic shedding
Limited concern
Allergen sensitivity to cotton or treatment additives
Limited concern
Lower concern; PFAS-free certified, organic cotton base.
✓Lab test found no PFAS
Lola
Organic Cotton Period Underwear
organic cotton with gusseted absorbent layer
Formaldehyde / VOCs
Limited concern
Azo dyes and color fastness
Limited concern
Microplastic shedding
Limited concern
Lower concern. Organic cotton core, no water-resistant treatment disclosed.
⚠Risky category by default
Ruby Love
Women's Ruby Love Period Underwear Hipster
organic cotton with water-resistant treatment
Coating degradation and microplastic shedding over time
Limited concern
Lower PFAS concern. Third-party certified PFAS-free absorbent underwear.
⚠Waterproof or stain-proof treatment
Icon Underwear
The High Waisted Period. in Organic Cotton For Heavy Flows
organic cotton with absorbent gusset
Azo dyes in textile coloring
Limited concern
Formaldehyde / VOCs
Limited concern
Gusset absorbent chemistry (unknown)
Limited concern
Antimony in polyester or nylon components
Limited concern
Lower concern. Organic cotton base unlikely to harbor PFAS.
⚠Risky category by default
Aisle
Super Hipster
Organic cotton, wood pulp fiber
Formaldehyde / VOCs
Limited concern
Lead
Limited concern
Wood pulp fiber degradation and microfiber shedding
Moderate concern
Undisclosed water-repellent or antimicrobial coating
Limited concern
Lower PFAS concern for period care, though brand transparency is absent.
⚠Risky category by default
Graded and flagged Poor and Bad, we’d swap these
Lola
Washable Period Underwear
Cotton blend with water-resistant treatment
Water-resistant coating composition (unverified)
Limited concern
Coating degradation and microfiber shedding
Moderate concern
Skin irritation from coating or dyes
Limited concern
Brand claims PFAS-free; no independent verification available
⚠Waterproof or stain-proof treatment
Lola
Bikini Period Underwear
organic cotton with water-resistant finish
Water-resistant coating composition (unspecified)
Limited concern
Microplastic shedding from synthetic finish
Limited concern
Formaldehyde / VOCs
Limited concern
Allergic sensitization from undisclosed additives
Limited concern
Brand claims PFAS-free, but no third-party verification provided.
⚠Waterproof or stain-proof treatment
Aisle
BOOST Hipster Size PFAS Free leakproof period underwear
absorbent fabric blend with proprietary waterproof barrier
Azo dyes in textile fibers
Limited concern
Formaldehyde / VOCs
Limited concern
Coating degradation and microparticle shedding
Limited concern
Skin sensitization from synthetic polymers
Limited concern
Brand makes clear PFAS-free claim, but third-party verification is lacking.
⚠Waterproof or stain-proof treatment
Modibodi
Basic Mid-Rise Brief Black
Organic cotton with waterproof leak-proof lining
PFAS
Limited concern
Microorganism growth if improperly dried
Limited concern
Coating degradation over repeated washing
High concern
Contact dermatitis or skin irritation
Limited concern
Waterproof period underwear; PFAS risk unknown, brand silent on treatment.
⚠Waterproof or stain-proof treatment
Modibodi
Classic Full Period Briefs
Organic cotton blend with unspecified waterproof/absorbent coating
Undisclosed waterproof coating chemistry
High concern
Formaldehyde / VOCs
Limited concern
Azo dyes and synthetic colorants
Limited concern
Coating degradation and microparticle shedding
Moderate concern
Skip until Modibodi discloses waterproof coating chemistry.
⚠Waterproof or stain-proof treatment
Modibodi
Basic Full Period Brief
Organic cotton, lycra blend with waterproof gusset treatment
Synthetic polymer leaching from lycra/gusset coating
Limited concern
Skin sensitization or irritation from coating degradation
Moderate concern
Microplastic shedding from synthetic components
Limited concern
Waterproof period underwear; PFAS use in gusset unclear from brand.
⚠Waterproof or stain-proof treatment
Proof
No Boundaries Boyshort Super Absorbency Period Underwear 2-Pack Womens
Cotton blend with water-resistant coating
PFAS
High concern
Microfiber shedding from synthetic coating
Limited concern
Bacterial growth under waterproof barrier if poorly maintained
Limited concern
Coating leaching into skin or bloodstream via absorption
Limited concern
Period absorbent underwear; waterproof coating creates PFAS risk.
⚠Waterproof or stain-proof treatment
Proof
Saalt Leakproof Period Cotton Brief, Heavy / S / Pink Dawn
organic cotton with waterproof coating (unspecified)
Unspecified waterproof coating chemistry
Limited concern
Coating degradation and microparticle shedding
Limited concern
Skin irritation or sensitization from finish chemicals
Limited concern
Organic cotton base is lower concern; waterproof coating unspecified and unexplained.
⚠Waterproof or stain-proof treatment
Proof
Hanes Women's Comfort Period. Brief Underwear
cotton blend with unspecified moisture/stain resistant coating
PFAS
High concern
Coating degradation and leaching with wear
Limited concern
Formaldehyde / VOCs
Limited concern
Skin irritation or sensitization from coating additives
Limited concern
Skip until brand discloses coating chemistry and PFAS status.
⚠Waterproof or stain-proof treatment
Proof
Thinx Teens Bikini Leakproof Period Underwear - Black
Gusseted cotton-blend fabric with water-resistant coating
Coating degradation and particle shedding
High concern
Formaldehyde / VOCs
Limited concern
Azo dyes in black fabric
Limited concern
Allergen irritation from undisclosed additives
Limited concern
Leakproof underwear likely uses water-repellent coating.
⚠Waterproof or stain-proof treatment
Ruby Love
Maximum Protection Period Underwear Bundle 10 Pieces Mix & Match
Cotton/nylon blend with waterproof coating
PFAS
Limited concern
Microfiber shedding from nylon-coating interface
Limited concern
Skin irritation from coating materials or residues
Limited concern
Waterproof period underwear; PFAS risk unknown, brand silent on treatment.
⚠Waterproof or stain-proof treatment
Icon Underwear
Icon Intimates & Sleepwear | Icon Undies Hi-Waist Period Underwear Panties Size Xs Beige (For Moderate Leaks) | Color: C
Cotton blend with water-resistant treatment (likely water-repellent coating finish)
Fluorocarbon-based water-resistant coating (water-repellent coating finish)
High concern
Coating degradation and microfiber shedding over time
Limited concern
Period underwear likely contains water-resistant coating; PFAS status unclear from brand.
⚠Waterproof or stain-proof treatment
Icon Underwear
Icon By Thinx Speax Bikini Women Ladies Underwear Bladder Moderate
Fabric with moisture-wicking and waterproof coating
Waterproof coating leaching (Teflon-family coating or polyurethane-based)
Limited concern
Coating microparticle shedding during washing
Moderate concern
Inadequate rinsing of residual coating chemicals
Limited concern
Moderate bladder protection likely requires water-resistant treatment; coating chemistry unclear.
⚠Waterproof or stain-proof treatment
Thinx
Intimates & Sleepwear Thinx for All Women's Period Underwear
Nylon, spandex, cotton blend with waterproof barrier layer
PFAS
High concern
Azo dyes in synthetic fibers
Limited concern
Microplastics
Limited concern
Coating adhesion and leaching as barrier degrades
Moderate concern
Skip until Thinx reveals waterproof coating chemistry and testing.
⚠Waterproof or stain-proof treatment
Thinx
Make The Switch Set Period Underwear
Cotton/synthetic blend with waterproof coating (composition unspecified)
PFAS
High concern
Microplastic shedding from synthetic coating
Limited concern
Formaldehyde / VOCs
Limited concern
Coating degradation and leachate into body
Moderate concern
Skip until Thinx discloses waterproofing agents and testing data.
⚠Waterproof or stain-proof treatment
Thinx
Cotton Starter Set Period Underwear
Cotton + proprietary waterproof/absorbent layer coating
PFAS
Moderate concern
Coating degradation and particle shedding
Limited concern
Bacterial growth if moisture is trapped
Limited concern
Moderate concern without waterproof coating transparency.
⚠Waterproof or stain-proof treatment
Knix
SuperPlus Leakproof No- Show High Rise Underwear
Cotton/synthetic blend with proprietary waterproof/leak-resistant coating (unspecified)
Undisclosed waterproof coating chemistry (likely fluorinated or silicone polymer)
Limited concern
Coating degradation and microparticle shedding with repeated wash cycles
Limited concern
Skip unless Knix discloses waterproof coating chemicals.
⚠Waterproof or stain-proof treatment
Knix
Women's Super Leakproof Dream Boxers
Fabric with waterproof/leak-resistant coating (unspecified chemistry)
Teflon-type coating or fluorochemical fume risk (if Teflon-type coating-based coating)
Limited concern
Microplastic shedding from coating degradation
Limited concern
Coating leachates during wear or washing
Limited concern
Lack of product lifecycle or end-of-life guidance
Moderate concern
Skip until Knix discloses coating chemicals or independent testing.
⚠Waterproof or stain-proof treatment
Knix
Medium-Flow Leakproof Period Underwear
Organic cotton/viscose with proprietary waterproof coating (unspecified)
Undisclosed waterproof coating chemistry
Limited concern
Skin sensitization from dyes or finishes
Limited concern
Coating degradation and leachables over time
Limited concern
Waterproof period wear with undisclosed coating creates uncertainty.
⚠Waterproof or stain-proof treatment
Saalt
Leakproof Comfort Brief
Organic cotton + polyurethane waterproof layer
Polyurethane coating degradation and leaching
Limited concern
Microplastic shedding from degraded coating
Limited concern
Skip until Saalt discloses waterproof coating or independent tests confirm PFAS-free.
⚠Waterproof or stain-proof treatment
Saalt
Leakproof Seamless Brief
Nylon/polyester blend with leak-proof coating (composition unspecified)
PFAS
High concern
Azo dyes in nylon-polyester blend
Limited concern
Antimicrobial finish (silver, triclosan, or quaternary ammonium)
Limited concern
Coating degradation and microparticle shedding
Moderate concern
Skip until coating transparency improves; waterproof textiles frequently use PFAS.
⚠Waterproof or stain-proof treatment
Saalt
Leakproof Cotton Brief Saalt
organic cotton with waterproof barrier layer (unspecified)
Waterproof barrier composition (unknown polymer type)
Limited concern
Microplastics
Limited concern
Adhesives or chemical treatments in seam construction
Limited concern
Skin irritation from barrier material or residual processing chemicals
Limited concern
Higher uncertainty requires PFAS-free confirmation from brand before purchase.
⚠Waterproof or stain-proof treatment
Aisle
Best-Selling Leakproof Period Boxer Brief - Essential Boxer Essential Boxer Eucalyptus / 2X
Cotton blend with unspecified waterproof/leakproof coating
Undisclosed waterproof/leakproof coating composition
High concern
Azo dyes and synthetic colorants in cotton blend
Limited concern
Formaldehyde / VOCs
Limited concern
Coating degradation and leaching over product life
Moderate concern
Skip until Aisle discloses coating chemicals or third-party testing.
⚠Waterproof or stain-proof treatment
Aisle
Essential High-Rise Period Brief – Leakproof Underwear Essential Brief Black / S
Unspecified waterproof/leak-resistant coating on undisclosed base textile
PFAS
Limited concern
Base textile finishing agents (undisclosed)
Limited concern
Dye migration and azo dyes
Limited concern
Coating degradation over repeated washing and body heat
High concern
Skip until Aisle discloses waterproofing chemicals; water-repellent coating finishes often use PFAS.
⚠Waterproof or stain-proof treatment
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