Boys Printed Briefs (7-Pack)
5-pack of cotton-polyester blend boxer briefs for boys. Popular and affordable.
How scores are calculated
Materials (40%): How plastic-free the product is — raw materials, construction, and coatings.
Packaging (20%): Is the product packaged in plastic? Is it recyclable?
Transparency (20%): Does the brand disclose ingredients, sourcing, and manufacturing?
Durability (20%): How long does it last? Longer-lasting products reduce plastic waste over time.
This is a rating of this specific product only — not the company. Other products from this brand may score differently.
Last updated: April 6, 2026
Underwear is in direct, prolonged contact with some of the body's most sensitive and absorptive skin. Synthetic fabrics release microplastics and phthalates through dermal absorption. For children, whose skin is thinner and more permeable, this exposure is particularly concerning.
Why We Rated It This Way
Old Navy's cotton-polyester blend is more concerning than pure cotton options. The polyester content increases microplastic exposure. A budget option but organic cotton is a better investment for children's underwear.
Chemical & Health Analysis
Each chemical of concern is broken down below — what it is, where it comes from in this product, what it does to the body, and who is most at risk.
Microplastics
Polyester fabric
Microfiber shedding in direct contact with sensitive skin
- ↳No Plastic in Nature: Assessing Plastic Ingestion from Nature to People — Environmental Science & Technology, 2019
- ↳Raman microspectroscopy detection and characterisation of microplastics in human breastmilk — Polymers (MDPI), 2022
- ↳Exposure to microplastics and human reproductive outcomes: A systematic review — BJOG: International Journal of Obstetrics and Gynaecology, 2024
All health claims are based on published, peer-reviewed research from the NIH, WHO, IARC, and peer-reviewed journals. This information is for educational purposes and does not constitute medical advice.
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