Reebok · Sports Performance Undergarments
Reebok Men's 7 Pack Performance Boxer Briefs, Medium
Basic boxer briefs with no known PFAS triggers.
This cotton-blend underwear lacks waterproofing, stain resistance, or nonstick coatings. No public testing or PFAS claims exist for this product.
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Material
Cotton blend, elastic waistband
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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.
Formaldehyde / VOCs
Cotton-blend basics may use formaldehyde-based resins for wrinkle resistance or sizing. No recall on record for this product; risk is low with pre-wash and low post-consumer exposure due to brief skin contact and breathable fit.
Source, ATSDR ↗Azo dyes and colorfast stability
Black or dark-colored boxer briefs may employ azo dyes; migration risk is minimal on low-coverage, non-acid-treated intimate apparel. Reebok does not specify dye testing; pre-wash and cool-temperature laundering reduce bleeding and skin contact.
Elastane (spandex) breakdown under heat or UV
Spandex degrades with repeated hot washing and high-heat drying, compromising elastic fit. Not a direct toxicant, but a durability and comfort issue; air drying extends product life and avoids exposing elastane to degradation conditions.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Antimony in polyester
Polyester in this blend is unlikely to contain antimony catalysts (more common in bottles and rigid plastics); no reported cases in apparel. Antimony concern is negligible for woven textiles.
Flame retardants
Flame retardants are not typically applied to basic underwear (not a regulated sleepwear or furniture item). No cause for concern.
Source, EPA ↗The full breakdown
What it's made of and why it matters
Reebok's 7-pack is a cotton blend, likely 80-90% cotton with polyester for stretch and durability. Cotton is a low-risk fiber; polyester adds strength but is inert once woven. The elastic waistband typically contains rubber or elastane (spandex), which is chemically stable in normal wear. Boxer briefs have minimal dye area and brief contact time with skin compared to full-coverage garments, reducing exposure to finish chemicals.
The brand's record and disclosure
Reebok does not publicly disclose detailed chemical inventories for basic apparel lines or claim specific certifications like OEKO-TEX or GOTS for this product. The brand has faced no major recalls or reported chemical hazards for men's basics in recent records. Parent company Authentic Brands Group has made generic sustainability commitments but does not specify formaldehyde-resin, azo-dye, or antimony testing protocols for this tier of product.
How it compares in its category
Men's performance boxer briefs from major brands (Nike, Under Armour, Adidas) operate under similar material standards and lack individual hazard documentation. A 7-pack at retail price suggests baseline chemical processing without premium wet-finish or water-resistant treatment. This product falls in the mid-market safety profile, no known issues, but also no enhanced testing claims distinguishing it from generic bulk underwear.
If you buy it
Wash in cool water before first wear to reduce any loosely bound dyes or residual finishes. Dry on low heat or air dry to prevent elastic degradation; high heat can compromise spandex elasticity over 50-100 wash cycles. Replace when elastic loses grip (typically 1-2 years with normal use). Avoid extended storage in sealed plastic; air dry completely to prevent moisture and odor buildup that may encourage mildew or bacterial growth.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Reebok has made none
Formulations change between production runs, so check the current label. How we grade.
More sports performance undergarments 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.