Microfiber Sheet Set (Queen)

Name: Microfiber Sheet Set (Queen)
Brand: Mainstays (Walmart)

PFR Grade

Poor — significant plastic content, use with caution

100% polyester microfiber. Sheds microplastic fibers with every wash and during sleep. No certifications. Mainstays is Walmart's most popular bedding brand.

PFR Caution

Queen microfiber sheet set. 100% polyester. Sheds microplastic fibers. Mainstays is Walmart's most popular bedding brand.

Score Breakdown

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.

Materials

Packaging

Transparency

Durability

$20See Safer Alternatives in Sleep & Home

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

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High Exposure Risk — Why This Product Category Matters

Adults spend 7-9 hours in bed every night — more time than in any other single location. Conventional mattresses, pillows, and bedding contain flame retardants (PBDE, TDCPP), PFAS stain-resistant treatments, formaldehyde off-gassing, and synthetic materials that off-gas VOCs throughout the night.

Synthetic Plastic Content

100%

synthetic plastic by weight

Why We Rated It This Way

Polyester microfiber sheets shed microplastic fibers with every wash (releasing up to 700,000 microplastic fibers per wash) and during sleep. Adults spend 7-9 hours in bed — sleeping on microplastic-shedding sheets means inhaling and ingesting microplastics throughout the night.

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.

Contains:100% polyester (microfiber)

microplastics

Source

Polyester microfiber sheets shedding microplastic fibers during sleep

Health Risk

Inhalation and ingestion of microplastics throughout the night

Who Is Most At RiskAdults and children sleeping on polyester microfiber bedding

Peer-Reviewed Sources

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.