Allbirds Women's Intimates & Sleepwear Allbirds Trino Bralette
Lower-concern base materials, but brand silence on PFAS processing leaves a data gap.
This bralette primarily uses merino wool and recycled fibers, materials with inherently lower PFAS risk. Allbirds doesn't market PFAS-free status or provide third-party verification for this product.
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Material
Merino wool, recycled materials (Allbirds typical blend)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Allbirds Women's Intimates Trino Bralette is made of, ingredients and materials
The Trino Bralette is constructed primarily from Merino wool, a protein fiber naturally resistant to microbial growth and odor without chemical antimicrobials. Allbirds typically incorporates recycled materials (likely recycled polyester or nylon) in the blend for elasticity and structure. Merino wool undergoes scouring during manufacturing, which removes lanolin and dirt but introduces minimal chemical residue compared to synthetic fibers. The combination avoids the heavy dye loads and chemical processing typical of conventional cotton-elastane bras.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Heavy metals
The specific dyes used in the Trino are not publicly disclosed. Allbirds' B-Corp certification implies some supplier screening, but formal OEKO-TEX or restrictive substance list compliance is not stated. Merino typically accepts gentler dyes than synthetic fibers, but confirmation requires direct brand inquiry.
Source, FDA ↗Antimony in polyester
If the recycled-content blend includes recycled polyester, antimony (a catalyst used in polyester synthesis) may be present at trace levels. Skin contact with polyester clothing carries minimal systemic absorption risk; this is primarily a manufacturing discharge concern.
Elastic degradation and microfiber shedding
Repeated washing and body heat degrade elastane (spandex) over time, potentially releasing microfibers into wash water. Merino-spandex blends are more durable than polyester-heavy alternatives, but no brand-specific durability data is published for the Trino.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
Merino wool does not require formaldehyde-containing wrinkle or shape-retention treatments. No formaldehyde finish use has been documented for Allbirds wool intimates, and wool's natural crimp provides structure without chemical crosslinking.
Source, ATSDR ↗Fragrance allergens from processing or finishing
No documentation of added fragrances or fragrance-based finishes in Allbirds wool bralettes. Merino wool naturally carries a faint lanolin odor that dissipates after first wash; no allergenic fragrance additives are standard in this product category from this brand.
How is this PFAS grade calculated?
The brand's record and disclosure
Allbirds publishes sustainability reports and maintains B-Corp certification, indicating third-party auditing of labor and environmental practices. However, the brand does not publicly disclose specific chemical processing standards for its intimates line or provide detailed fiber safety certifications (e.g., OEKO-TEX or Cradle-to-Cradle). Their silence on PFAS use in water-repellent finishing or elastic dyes represents a data gap rather than evidence of unsafe practice. No product recalls or chemical safety incidents involving Allbirds bralettes have been publicly documented.
How it compares in its category
Merino wool bralettes sit at the lower-chemical end of intimates. Conventional sport bras often use polyester-spandex blends with synthetic dyes, flame retardant finishes (unnecessary for non-sleepwear but sometimes applied), and formaldehyde-containing resins for shape retention. The Trino avoids those typical hazards by relying on wool's inherent properties. Comparable eco-brands (Patagonia, Organic Basics) offer similar or identical transparency levels, making Allbirds neither an outlier nor a leader in disclosure.
If you buy it
Wash in cool water with wool-specific detergent (standard soap or enzyme cleaners can degrade protein fibers). Do not machine dry; air dry flat to prevent elastic degradation. Avoid prolonged chlorine exposure or bleach. Replace when elastic loses tension (typically 1-2 years with regular wear) or seams separate. No special heat precautions needed; wool melting point is above 300°F, well above any normal wearing scenario.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Allbirds has made none
Formulations change between production runs, so check the current label. How we grade.
More sports bras 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.