For roughly fifteen years, fiberglass has been the most common fire barrier in low-cost mattresses sold in the United States. It is typically not listed on the law tag. It is not visible from the outside. Most consumers who own one do not know it is there. And it is now in the process of being legislated out of the category — quietly, state by state, starting with California in 2027.

This is the story of how fiberglass ended up in mattresses in the first place: the federal flammability standard that drove it, the chemical flame retardant phaseout that displaced it from foam, the cost-cutting that made it dominant in bed-in-a-box construction, the lawsuit wave that brought it into public view, and the state-level regulatory response that is now underway.

The Consumer Product Safety Commission published the final rule for 16 CFR Part 1633, the federal open-flame flammability standard for mattress sets, in the Federal Register on March 15, 2006 (Vol. 71, No. 50). It took effect July 1, 2007, issued under the authority of the Flammable Fabrics Act.

The standard was designed to address a specific gap. An earlier CPSC rule — 16 CFR Part 1632 — covered smoldering ignition (a lit cigarette), but mattress fires ignited by open flames such as lighters, candles, and matches were not directly regulated. CPSC research, drawing on testing by the National Institute of Standards and Technology, had documented that traditional mattress constructions could reach peak heat release rates exceeding 2,000 kW within five minutes of open-flame ignition — well past the threshold at which a typical bedroom transitions to full flashover.

Part 1633 establishes performance requirements, not material requirements. A mattress set must:

CPSC estimated the standard would prevent approximately 250 deaths and 1,250 injuries annually, with first-year societal savings between $500 million and $1.1 billion.

What matters most about Part 1633 is what it does not specify. It does not specify a fire-barrier material. It does not require chemical treatment. It does not prohibit any particular substance. A manufacturer can meet the standard with wool, rayon, polylactic acid batting, modacrylic fiber, chemical flame retardants, or fiberglass — whatever passes the burn test. That technology-neutral structure is what set the stage for everything that followed.

When Part 1633 took effect in 2007, the most common path to compliance was chemical. Manufacturers applied flame retardants to polyurethane foam or incorporated them into fabric barriers. The dominant classes:

As the health data accumulated through the 2010s and consumer awareness grew, regulatory pressure tightened around these compounds. California acted first. Assembly Bill 2998, signed into law in 2018, prohibited the sale of juvenile products, mattresses, and upholstered furniture containing covered flame retardants above 1,000 ppm. The law took effect January 1, 2020.

There was a critical limitation. The 2018 law applied to the foam portion of mattresses. Other components — thermal barriers, fire socks, the layers responsible for actually meeting Part 1633 — were exempt.

That exemption is what created the opening for fiberglass.

With chemical flame retardants restricted in foam and the federal performance requirements unchanged, manufacturers needed a fire barrier that could meet Part 1633 without using the now-restricted chemistry. Several options existed: organic wool, modacrylic fibers, rayon blends, and polylactic acid batting all qualify. Each costs more than the alternative that came to dominate.

Fiberglass is glass spun into extremely fine fibers. When exposed to flame, the fibers char without melting, forming a self-insulating barrier that disrupts combustion. It physically meets Part 1633 without chemical treatment. And it is, by a substantial margin, the cheapest qualifying option — adding pennies per mattress rather than dollars.

The typical construction: a sock of glass-fiber-containing fabric wrapped around the foam core, positioned just inside the outer cover. From the outside, the mattress looks the same as any other foam mattress. The law tag may list "glass fiber," "glass wool," or "fiberglass" as a filling material, often as a percentage, but the disclosure is not required by federal regulation to appear prominently. Many products buried it.

The strategy worked from a compliance standpoint. The mattress passed Part 1633. The foam met California's flame-retardant restrictions. The unit cost stayed low enough for online retailers to sell a queen mattress for under $400 with free shipping. Throughout the late 2010s and early 2020s, fiberglass became standard in cost-competitive bed-in-a-box construction — particularly in foam-only models from brands that sell primarily through Amazon, Walmart, Wayfair, Target, and direct-to-consumer sites.

The entire design relied on one assumption: the cover stays on.

Most fiberglass-containing mattresses ship with a zippered outer cover and a tag warning consumers not to remove it. The warning is often the only indication that something hazardous lies inside.

Consumers, accustomed to washing zippered covers from their other bedding, removed them. When the cover came off, microscopic glass fibers escaped — dispersing through HVAC systems, embedding in carpets, upholstery, clothing, and bedding throughout the home. The fibers are extremely difficult to remove. Professional remediation typically runs $3,000 to $10,000, sometimes substantially more, and in serious cases, families have abandoned contaminated belongings entirely.

The health effects are well-documented: skin irritation, eye inflammation, and upper-respiratory irritation when fibers are inhaled. Most fiberglass fragments shed from mattress covers are large enough to primarily affect the upper airway rather than penetrate deeply into the lungs, the way ultrafine fibers such as asbestos can. But once dispersed into a home, the fibers are difficult to remove without professional remediation, and exposure tends to recur as disturbed materials redistribute particles.

A 2022 study by researchers at the California Department of Public Health, published in the International Journal of Environmental Research and Public Health, examined four mattress covers and observed fiberglass in two of them, including potentially inhalable fragments that could pose a health risk if the covers were opened by consumers. The study formalized what had by then been widely reported: that the containment-only safety model had a foreseeable failure mode.

The litigation began in March 2020, when Amanda Chandler and Robert Durham of Illinois filed a class action against Zinus Inc. and major online retailers (Amazon, Walmart, Target, Wayfair, eBay) after their family's Zinus Green Tea memory foam mattress released fiberglass following routine cover removal. The case was prompted in part by a CBS affiliate report — "Hidden Hazards," broadcast on KMOV4 in St. Louis in February 2020 — that covered the family's experience.

The case expanded. Vanessa Gutierrez, a California mother, joined in 2021 and later filed her own class action after non-Illinois residents were removed from the original. Her household had spent more than $20,000 on medical bills and contamination cleanup after fiberglass exposure left visible scars on her young daughter. Reporting through CBS News and Inside Edition brought the broader pattern into public view.

By 2022, the consolidated litigation involved approximately 2,000 plaintiffs across 50 states. Subsequent lawsuits named additional brands, including Nectar and Ashley Furniture. Claims included deceptive marketing, breach of warranty, and violations of the Magnuson-Moss Warranty Act.

The most prominent case — Gutierrez v. Zinus, filed in California federal court in July 2022 — was voluntarily dismissed without prejudice on August 25, 2023, following a private settlement reached through mediation. Settlement details were not disclosed in court filings. The original Illinois case (Chandler v. Zinus) followed a similar private resolution. Arbitration clauses in some manufacturers' terms of sale have constrained broader class certification in subsequent litigation, though individual claims and settlement distributions have continued through 2025 and 2026. The cases shaped industry behavior more than they established a single binding legal outcome.

Industry responses varied. Some manufacturers adopted non-removable covers and more prominent warnings. Zinus publicly announced a transition to carbon-rayon sleeves in newly produced mattresses, though the company maintained that fiberglass had been used in compliance with federal standards. Many other brands quietly shifted to alternative fire barriers — modacrylic, rayon blends, or polylactic acid batting — ahead of the regulatory wave they could see coming.

In February 2023, California Assemblymember Laura Friedman (D-Glendale) introduced Assembly Bill 1059, sponsored by the Environmental Working Group. The bill passed both chambers on bipartisan votes and was signed into law by Governor Gavin Newsom on October 8, 2023.

AB 1059 does three things:

The bill includes targeted exemptions for two specific fibers: aramid fiber (when used in interior fabric or in the fabric covering the non-sleep surface of a single-sided mattress), and modacrylic fiber that does not contain antimony trioxide. The modacrylic exemption is conditional. AB 1059 requires the International Sleep Products Association to submit a quantitative health risk assessment of antimony-free modacrylic fiber from an independent board-certified toxicologist by October 1, 2025. The results will inform whether additional restrictions follow in 2026.

Tasha Stoiber, Ph.D., a senior scientist at EWG, summarized the position in a statement when the bill passed: "Fiberglass shouldn't be used in mattresses."

California is a regulatory bellwether for the consumer goods industry. As the world's fourth-largest economy, it accounts for enough U.S. retail volume that manufacturers typically reformulate for the national market rather than maintain two supply chains. Restrictions enacted in California on personal care ingredients, food additives, and household chemicals have repeatedly spread nationally through the same dynamic.

As of mid-2026, California remains the only state with an enacted fiberglass mattress ban. In April 2025, New York Assemblymember David Weprin introduced Assembly Bill 7912, which would restrict the sale of children's products, mattresses, and upholstered furniture containing fiberglass in New York — though in its current amended form, the New York bill takes a softer approach than California's, prohibiting the sale only of products that do not carry a prominent consumer warning label. The bill remains pending in committee and has not been enacted. Several other states have flame-retardant restrictions of varying scope, but none specifically address fiberglass. The modacrylic study mandated by California (due in late 2025) may also prompt follow-on California legislation in 2026, which would likely set the template for any further state action.

Federal regulation has not kept pace. 16 CFR Part 1633 remains the only federal mattress flammability standard, and it continues to operate on performance terms rather than on material restrictions. CPSC has not opened rulemaking on fiberglass specifically. In the immediate future, regulatory pressure is state-by-state, and California is the only state with a binding prohibition on sales on the books.

Until January 1, 2027, fiberglass remains legal in mattresses sold anywhere in the United States, including California (the ban is prospective). Voluntary industry change is underway, but uneven. The most reliable protection — independent of any individual brand's claims — comes from finished-product certifications that explicitly prohibit fiberglass:

Disclosure indicators worth checking before purchase:

For a step-by-step identification guide, see Does My Mattress Contain Fiberglass? What You Need to Know.

No Avocado mattress contains fiberglass. We have never used fiberglass. Most Avocado mattresses use certified organic wool as their natural flame barrier — wool meets 16 CFR Part 1633 through char-and-extinguish chemistry without chemical treatment and without fiberglass. The Avocado Vegan Mattress uses a graphite- and charcoal-infused organic latex barrier in place of wool. Both approaches are independently verified under GOTS, OEKO-TEX® Standard 100 Class I, MADE SAFE®, EWG Verified®, GREENGUARD Gold, and UL® Formaldehyde-Free — each of which addresses different substances through different methodologies, and each of which prohibits or independently verifies the absence of fiberglass.

Avocado mattress covers can be unzipped without risk of contamination because there is nothing inside them that becomes hazardous when exposed to air.

Yes, in most of the United States, as of mid-2026. Fiberglass remains legal as a fire barrier in mattresses sold under federal flammability requirements (16 CFR Part 1633). California will become the first state to prohibit the sale of mattresses containing textile fiberglass, effective January 1, 2027, under Assembly Bill 1059. No other state has enacted a comparable ban as of this writing.

January 1, 2027. AB 1059 was signed into law by Governor Gavin Newsom on October 8, 2023, and applies to mattresses, juvenile products, and upholstered furniture sold in California. The ban also applies to upholsterers in the state who use fiberglass for repair or reupholstery.

AB 1059 prohibits the sale of mattresses, juvenile products, and upholstered furniture containing textile fiberglass in California, effective January 1, 2027. It also extends California's existing flame-retardant restrictions — originally enacted under AB 2998 in 2018 for the foam portion of mattresses — to all mattress components, closing the thermal-barrier exemption that previously allowed fiberglass to fill the gap.

Federal law (16 CFR Part 1633, effective July 1, 2007) requires all mattress sets to meet an open-flame fire resistance test. Initially, most manufacturers met the standard with chemical flame retardants, but research linking those chemicals to endocrine disruption and other health effects drove regulatory action — most prominently California's 2018 ban on chemical flame retardants in the foam portion of mattresses. Fiberglass became the dominant replacement because it physically meets the federal standard at a fraction of the cost of natural alternatives like wool, modacrylic, or rayon.

The most prominent litigation has involved Zinus Inc., named in a class action originally filed in Illinois in March 2020 (Chandler v. Zinus) and subsequently expanded to include co-defendants Amazon, Walmart, Target, Wayfair, and eBay. By 2022, the consolidated litigation involved approximately 2,000 plaintiffs across 50 states. The most prominent case — Gutierrez v. Zinus, filed in California federal court in July 2022 — was voluntarily dismissed without prejudice on August 25, 2023, following a private settlement; the original Illinois case followed a similar resolution. Settlement details were not disclosed in court filings. Subsequent suits have named additional brands, including Nectar and Ashley Furniture. Coverage in CBS News, Inside Edition, and CBS affiliate KMOV4 St. Louis brought broader public attention to the cases.

EWG and the California legislature have identified several non-fiberglass alternatives that meet federal flammability requirements: organic wool, rayon, modacrylic fibers (subject to ongoing health assessment in California), and polylactic acid batting. Avocado uses certified organic wool across most mattress models, and a graphite-infused organic latex barrier in its Vegan Mattress.

As of mid-2026, California is the only state with an enacted ban. In April 2025, New York Assemblymember David Weprin introduced Assembly Bill 7912, which would restrict the sale of children's products, mattresses, and upholstered furniture containing fiberglass in New York. As currently amended, the bill operates as a labeling requirement (prohibiting the sale of fiberglass-containing products that do not carry a prominent consumer warning) rather than an outright ban. It remains pending in committee and has not been enacted. Several other states have flame-retardant restrictions of varying scope, but none specifically address fiberglass. California's regulatory action has historically migrated to other states and into broader national manufacturer reformulation; additional state action is possible but not yet enacted.

Check the law tag for "glass fiber," "glass wool," or "fiberglass" — often listed as a percentage of filling materials. Look for "Do Not Remove Cover" warnings, which often signal a containment-dependent design. Check the brand's materials disclosure: brands that do not use fiberglass typically state this prominently as a selling point; brands that do often bury it or omit it. As a rough proxy, low-cost foam-only mattresses sold online are statistically more likely to contain fiberglass.

No. Every Avocado mattress uses certified organic wool as its natural flame barrier (the Avocado Vegan Mattress uses a graphite-infused organic latex barrier in place of wool). Both approaches meet federal flammability standards without chemical flame retardants or fiberglass and are independently verified by GOTS, OEKO-TEX® Standard 100 Class I, MADE SAFE®, EWG Verified®, GREENGUARD Gold, and UL® Formaldehyde-Free.

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