Meilleures marques de sous-vêtements sans microplastiques
Après l’affaire PFAS de Thinx, voici le guide posé des marques de sous-vêtements dont les matériaux peuvent être réellement vérifiés.
Par L’équipe PlasticFreeLabMis à jour le 16 juin 202613 min de lecture
Mention·PlasticFreeLab teste et recommande en toute indépendance. Nous percevons parfois une commission lorsque vous achetez via nos liens — elle n’influe jamais sur nos classements.
Comment 91/100 est obtenu.
Pact Organic Cotton Underwear
Pact is the only brand at this price point that carries Fair Trade Certified and GOTS certifications across its full underwear line, with a published Tier 1 supplier list. Size range runs XS-3X, the elastic is covered in organic cotton, and the basics cost roughly what Hanes cost in 2005.
Tout ce que nous achèterions, par ordre.
- 01Best overall91
Pact Organic Cotton
GOTS-certified organic cotton, Fair Trade Certified factory, XS-3X sizing, and a basics price that makes this a sensible full-drawer replacement. Elastic bands are cotton-covered, not exposed polyester. Pact publishes its factory list and dye chemistry. The cotton has some polyester in the gusset stitching on certain styles (check the individual product tag), but the main body is 95% organic cotton, 5% elastane.
PublicitéCheck Amazon - 02Best premium89
Subset (formerly Knickey)
GOTS-certified and OEKO-TEX Standard 100 on the full line, sewn in a fair-wage factory in India, with a free recycling program for used underwear. The cotton is softer out of the box than Pact's; you notice on day one. The waistband is the most comfortable in this category. Price is roughly double Pact. Sizing goes to 2XL, which is less inclusive than Pact's 3X.
PublicitéCheck Amazon - 03Best for inclusive sizing88
MATE the Label
GOTS organic cotton with sizing from XXS to 4X, the broadest range we found. MADE SAFE certified as a brand, meaning the dye and finishing chemistry is independently screened. Slightly heavier fabric than Pact, which wears longer. Price sits between Pact and Subset. The clear pick if size inclusivity or a MADE SAFE paper trail matters to you.
PublicitéCheck Amazon - 04Best US-made85
Harvest & Mill
US-grown, US-milled, US-sewn organic cotton. One of the only fully-domestic supply chains left in intimate apparel. No synthetic elastic; the waistband uses natural rubber. Limited style range and price per pair is roughly triple Pact. Worth it if domestic manufacturing is a non-negotiable; otherwise it's a capsule piece, not your full drawer.
PublicitéCheck Amazon - 05Honorable mention74
Boody Bamboo Viscose
OEKO-TEX 100 certified bamboo viscose. Exceptionally soft, stretchy, and well-priced. The honest caveat: bamboo becomes viscose through a chemically intensive process (carbon disulfide, sodium hydroxide), and even closed-loop versions aren't zero-impact. Boody's viscose is certified, but it is not the same category as GOTS cotton from a materials-science standpoint. Fine as a supplement; not our recommendation as a sole replacement.
PublicitéCheck Amazon - 06Honorable mention79
Organic Basics
GOTS organic cotton with a SilverTech antibacterial line that uses recycled silver ions. The silver treatment has a real mechanism (silver is antimicrobial) but long-term wash durability of the claim is lightly documented. The non-treated organic cotton line is straightforward and well-made. Price is Euro-premium and shipping from Copenhagen adds to it.
PublicitéCheck Amazon - 07Best hemp alternative76
WAMA Hemp Underwear
53% hemp, 43% organic cotton, 4% spandex. Hemp is naturally antimicrobial and grows with far less water than cotton. OEKO-TEX Standard 100 certified. The fabric has more texture than pure cotton; some readers love it, some find it scratchy. We'd recommend starting with one pair before replacing a drawer.
PublicitéCheck Amazon - 08Best for sensitive skin80
Cottonique Hypoallergenic
100% organic cotton with no elastic at all. The waistband uses a cotton drawstring. Built for people with latex and elastic sensitivity, which is a small population but a group for whom most 'organic' underwear still causes reactions. Unglamorous, utilitarian, and the right answer for a specific use case.
PublicitéCheck Amazon - 09Best period underwear83
Saalt Leakproof
Post-Thinx, Saalt is the period underwear brand we'd buy. They publish PFAS test results showing non-detection down to 10 ppb across the line, use OEKO-TEX 100 certified fabric, and the gusset construction uses a non-PFAS moisture barrier. Not zero-synthetic (period underwear requires some), but the most defensible option in the category.
PublicitéCheck Amazon
Nommé, pas sous-entendu.
Thinx (original line)
Skip58In 2023 Thinx settled a class-action lawsuit over undisclosed PFAS in its period underwear for $4 million, without admitting liability. Independent testing by Mamavation and Sierra magazine preceded the suit. Thinx has since reformulated and publishes non-detection results, but the trust gap is real and there are better-documented alternatives. We'd pick Saalt instead.
Comment ce comparatif a été établi
- Critères de sélection
- Matériaux divulgués, certifications indépendantes, durabilité en cuisine réelle, essais de contamination indépendants lorsque disponibles.
- Méthode d’évaluation
- Déclarations des fabricants, documents réglementaires, articles évalués par les pairs et essais d’usure en conditions réelles. Nous lisons les étiquettes et les pièces, pas les communiqués.
- Qui nous contredit
- Nous formulons la position adverse au mieux dans chaque comparatif, et nommons la marque que nous avons failli choisir, en disant pourquoi nous ne l’avons pas retenue.
- Ce qui nous ferait changer d’avis
- De nouveaux essais indépendants, la reformulation d’un produit classé ou un résultat évalué par les pairs contredisant notre raisonnement actuel.
Les questions qui reviennent le plus.
- What actually happened with the Thinx lawsuit?
- In 2020, independent testing by Sierra magazine detected PFAS in Thinx period underwear, contradicting the brand's marketing. A class action followed. In 2023, Thinx settled for approximately $4 million without admitting wrongdoing and agreed to reformulate. The settlement documents and testing reports are public. Thinx's current line tests non-detect; the original problem was real.
- Is organic cotton underwear really plastic-free?
- Mostly, with caveats. GOTS-certified organic cotton is plastic-free in the fabric itself. The elastic is the question. Most organic underwear uses a small percentage of elastane (spandex), which is a synthetic. Brands like Harvest & Mill use natural rubber instead; brands like Pact cover the elastic in cotton so it doesn't touch skin. Truly zero-synthetic is possible (Cottonique) but rare.
- What does GOTS certification mean?
- The Global Organic Textile Standard certifies both the fiber (organic cotton must be at least 70% to 95% of fabric weight depending on tier) and the processing chemistry. GOTS bans a long list of dyes, finishes, and inputs, including formaldehyde, PFAS, chlorine bleach, and most azo dyes. It's the strictest widely-available textile certification. Look for the GOTS logo with a license number on the garment tag.
- Is bamboo underwear plastic-free?
- It depends on the process. 'Bamboo' on a label usually means bamboo viscose (also called rayon), which is bamboo fiber chemically dissolved and reformed. The process involves carbon disulfide and sodium hydroxide. Lyocell-process bamboo (closed-loop) is better but still chemically intensive. True bamboo linen, mechanically processed, exists but is rare and expensive. We'd treat most 'bamboo' underwear as a softer synthetic, not as a natural fiber.
- Do synthetic fabrics actually shed microplastics during wear?
- Yes. A 2020 study in Environmental Science & Technology (De Falco et al.) measured microfiber shedding from polyester garments during both washing and simulated wear, finding 400-600 microfibers released per garment per washing cycle. Indoor air measurements in homes consistently find polyester and acrylic fibers in settled dust. Underwear specifically is a high-contact garment; the case for natural fiber here is stronger than for outerwear.
- How do I wash organic cotton underwear to make it last?
- Cold wash, gentle cycle, hang dry or low tumble. The dryer's high heat is what kills elastane first. Once the waistband loses stretch, the garment's done. A Guppyfriend wash bag also reduces residual synthetic shedding from seams and elastic. Most of our test pairs are going on 18+ months with no visible wear.
De nouveaux essais indépendants contredisant notre classement. La reformulation discrète d’un produit en tête qui abandonne une certification déclarée. Un article évalué par les pairs modifiant le tableau de la sécurité pour l’un des matériaux ci-dessus. Nous mettons cette page à jour sous une semaine et signalons ce qui a changé.
Sources citées sur cette page.
- 01Thinx class action settlement (Dickens v. Thinx Inc., 2023)
- 02Sierra magazine — Thinx PFAS testing (2020)
- 03Global Organic Textile Standard (GOTS) — certification criteria
- 04OEKO-TEX Standard 100 — testing criteria
- 05De Falco et al. 2020 — Microfiber release to water via laundering and abrasion, Environmental Science & Technology
- 06MADE SAFE certification standards
L’équipe PlasticFreeLab
Un petit groupe de chercheuses et de rédacteurs qui démêle le bruit autour du quotidien non toxique. Nous lisons les études, lisons les étiquettes, testons les produits — et actualisons nos recommandations à mesure que la science évolue. Nous n’acceptons aucun paiement pour un placement, divulguons chaque relation d’affiliation et nommons les marques que nous écartons.
À découvrir dans cette rubrique.
- L’explicatif8 min
Que sont les microplastiques ? Un explicatif en français clair
Microplastiques · Les microplastiques sont de petits fragments de plastique inférieurs à 5 mm. Voici de quoi ils sont faits, d’où ils viennent et ce que disent calmement les données sur la santé humaine.
- L’enquête de fond11 min
Endocrine Disruptors (EDCs): What They Are and How to Limit Exposure
Microplastiques · What endocrine disruptors are, the main classes like BPA and phthalates, how they affect hormones, who is most at risk, and how to lower exposure.
- Le comparatif14 min
Best Non-Toxic Laundry Detergents of 2026, Tested and Ranked
Maison · We ranked 8 non-toxic laundry detergents on ingredient transparency, fragrance, cleaning power, and value, with EPA, FDA, and EWG sources and one to skip.
Recevez l’audit cuisine.
Une liste imprimable de plus de cinquante objets de cuisine, chacun classé en : à remplacer maintenant / à remplacer plus tard / à laisser. Gratuit. Reçu immédiatement.
En vous abonnant, vous acceptez notre politique de confidentialité. Une infolettre apaisée par semaine. Désabonnement à tout moment.
50+ objets