Is Knix PFAS-free?
Across 19 graded products, Knix averages F (41/100). On disclosure, the brand says nothing publicly about PFAS. 2 of its products grade C or better. Grades are model-based estimates, not lab results.
Worth buying from Knix C or better, safest first
Knix
Teen Super Leakproof Reusable Snap Pads
organic cotton/synthetic blend with waterproof backing
Lower-concern period pad; brand actively avoids PFAS in waterproof layer and provides third-party verification.
✓Lab test found no PFAS
Knix
Essential No-Show Bikini 5-Pack
Cotton-blend gusseted underwear; moisture-wicking fabric (likely polyester blend)
Lower concern period underwear, but Knix has not publicly disclosed PFAS testing or commitment.
⚠Risky category by default
Graded and flagged D and F, we’d swap these
Knix
Momenta Racerback Sports Bra
Nylon/spandex blend fabric (no reported specialty coating)
Lower-concern sports bra; standard textile, but Knix has not disclosed PFAS stance.
⚠Risky category by default
Knix
Intimates & Sleepwear Catalyst Sports Bra Knix
Nylon, spandex, polyester blend (no water-repellent or stain-resistant treatment disclosed)
Lower concern, basic athletic textile blend with no waterproofing or stain treatment disclosed, but verify final garment details.
⚠Risky category by default
Knix
Catalyst Front Zip Sports Bra
nylon, spandex, elastane blend
Lower concern; typical athletic blend with no known PFAS triggers, but brand offers no transparency.
⚠Risky category by default
Knix
Revolution Busty Bra
Fabric blend (likely nylon, elastane, cotton base)
Lower concern; no water-repellent claims, but brand transparency on PFAS is absent.
⚠Risky category by default
Knix
Intimates & Sleepwear Knix Revolution Adjustable Pullover Bra
nylon, elastane, polyester blend with no disclosed coating
Lower-concern basics; no PFAS red flags, but brand discloses nothing about chemical treatments.
⚠Risky category by default
Knix
SuperPlus Leakproof No- Show High Rise Underwear
Cotton/synthetic blend with proprietary waterproof/leak-resistant coating (unspecified)
Skip until Knix discloses coating chemistry or pursues third-party PFAS verification.
⚠Waterproof or stain-proof treatment
Knix
Women's Super Leakproof Dream Boxers
Fabric with waterproof/leak-resistant coating (unspecified chemistry)
Skip until Knix discloses coating chemistry or provides third-party testing.
⚠Waterproof or stain-proof treatment
Knix
Medium-Flow Leakproof Period Underwear
Organic cotton/viscose with proprietary waterproof coating (unspecified)
Waterproof period underwear with no disclosed coating ingredients, higher uncertainty on PFAS risk.
⚠Waterproof or stain-proof treatment
Knix
Period Underwear Teen Leakproof UltraThin No-Show Bikini 3-Pack
Fabric + undisclosed waterproof/leakproof coating
Skip until Knix discloses coating chemistry or provides third-party testing.
⚠Waterproof or stain-proof treatment
Knix
KT by Knix Super Leakproof Reusable Snap Pads
Reusable fabric with waterproofing layer; composition unspecified
Skip until waterproofing chemistry is disclosed, reusable pads typically need water-repellent coating treatment, often PFAS-based.
⚠Waterproof or stain-proof treatment
Knix
Heavy Flow & Bladder Leak Protection Boybrief
Absorbent core with waterproof backing (material unspecified by brand)
Skip until brand discloses waterproof coating chemistry, period-care products with moisture barriers often use PFAS-based water-repellent coating treatments.
⚠Waterproof or stain-proof treatment
Knix
Super Leakproof Cotton Boybrief
Cotton with undisclosed waterproof/leakproof coating
Skip until Knix clarifies coating chemistry, waterproof menstrual underwear frequently uses PFAS-based water-repellent coating treatments.
⚠Waterproof or stain-proof treatment
Knix
Essential No-Show High Rise 5-Pack
Synthetic blend with moisture-wicking/waterproofing treatment
Skip until brand discloses waterproofing chemistry; period-care products with water-repellent coating treatments warrant PFAS clarification.
⚠Waterproof or stain-proof treatment
Knix
Heavy Flow & Bladder Leak Protection Bikini
absorbent fabric blend + waterproof backing layer (unspecified)
Skip until Knix discloses waterproof treatment chemistry, period underwear's wetness barrier is a classic PFAS red flag.
⚠Waterproof or stain-proof treatment
Knix
Longevity Sports Bra
Nylon blend with moisture-wicking treatment (water-repellent coating finish likely)
Skip until brand discloses PFAS status, sports bra's water-resistant finish is a PFAS red flag.
⚠Waterproof or stain-proof treatment
Knix
Catalyst Sports Bra
Nylon/polyester blend with moisture-wicking treatment
Skip until Knix clarifies waterproof treatment chemistry.
⚠Waterproof or stain-proof treatment
Knix
Engage Medium Impact Sports Bra
Nylon/polyester blend with undisclosed water-resistant treatment
Moderate concern, sports bra likely has water-repellent coating finish, but Knix discloses nothing about PFAS use or alternatives.
⚠Waterproof or stain-proof treatment
Every grade uses the same public rubric. How grades work →