The most important sentence on this page: Don't unzip the outer cover of any mattress unless you're certain it doesn't have a fiberglass fire barrier inside. If you're not sure, leave it alone — this guide will show you how to find out.
If you found this page because of the recent Nectar or Zinus headlines and you're wondering whether your own mattress is part of the problem, here's the short version before the long one.
Fiberglass fire sleeves are common in budget-tier and older mattresses sold in North America, concentrated in the under-$400 price tier. As long as the cover stays on, the fiberglass stays put. Almost every horror story in the news started the same way: someone unzipped a cover, usually to wash it after a spill, and accidentally exposed what was underneath. When that happens, fiberglass gets everywhere, and it is genuinely awful to clean up.
The rest of this guide is for the worried reader who wants the whole picture: how to check the mattress you already own, how to find a fiberglass-free mattress if you're shopping, what to do if yours does contain fiberglass, what to do if you've already removed a cover, what the lawsuits actually allege, and what the science says — honestly.
How to check the mattress you already own
Every mattress sold in the US and Canada is required by law to carry a tag sewn into the side seam that lists every material inside by percentage. It's called a law tag — the mattress's nutrition label.
Find it. Pull the bedding back. The tag is usually on one of the long sides near a corner, about the size of an index card. Read the fill list. You're looking for one of these:
- "Glass fiber" or "fiberglass" — your mattress contains fiberglass, usually between 5% and 25%.
- "Silica strands," "silica fiber," or any term with silica in it — same material, different name. Some manufacturers prefer the silica wording because it sounds less alarming.
- "Wool," "rayon," "viscose rayon," "modacrylic," or "aramid" — non-fiberglass fire barriers. You're fine on this front.
- Tag missing, faded, or unreadable — assume it might contain fiberglass and don't unzip the cover. Check the manufacturer's website or contact customer service.
If you can't find the tag, look up the brand and model online. Most manufacturers publish their material specs. If they don't, email customer support and ask in writing: "What is the fire barrier material in [model name]? Does it contain fiberglass or glass fiber?" Save the response. The brands that won't answer plainly are giving you information by their silence.
How to find a fiberglass-free mattress
If you're shopping for a new mattress and want to avoid this situation, fiberglass-free mattresses are easier to find than they used to be — and you don't have to spend $4,000 to get one. The challenge is that brands using fiberglass don't advertise it, so you have to know how to look.
The simple test. Before you buy anything, find the full materials list on the manufacturer's website. Search for the words fire barrier, fire sock, flame barrier, or flame retardant. If the description names a specific non-fiberglass material — wool, viscose rayon, modacrylic, aramid — you're fine. If it says "non-toxic fire barrier" or "proprietary blend" without specifics, that's a yellow flag worth following up on. A brand that won't answer in writing is telling you something.
The certifications that prohibit fiberglass. None of these certifications allow fiberglass in their certified products:
- GOTS (Global Organic Textile Standard) — for cotton and wool components.
- GOLS (Global Organic Latex Standard) — for latex.
- MADE SAFE — broader chemistry-safety certification covering the full mattress.
Note that GreenGuard Gold is a strong emissions certification but doesn't specifically prohibit fiberglass. CertiPUR-US is foam-only and tells you nothing about the fire barrier — a CertiPUR-US-certified mattress can absolutely contain fiberglass underneath the foam it certifies. We wrote a whole piece on what CertiPUR-US actually tests for.
Fiberglass-free mattress brands with documented disclosure
These brands publish their full material composition publicly and confirm in their product specifications that their mattresses do not contain fiberglass. We don't take affiliate commissions from any of these brands — the list is based on documented disclosure, not paid placement.
- Avocado Green — GOLS-certified organic latex, GOTS-certified wool fire barrier, GOTS-certified organic cotton cover. Public materials disclosure on every product page.
- Naturepedic — Wool batting fire barrier, organic cotton cover, optional latex core. GOTS, GOLS, GreenGuard Gold, and MADE SAFE certified. Recently became the first mattress brand to receive EWG Verified certification.
- Obasan — Canadian, made in Ottawa. GOLS-certified organic latex, GOTS-certified wool and cotton. Manufactures in-house and publishes the complete material chain.
- Soaring Heart — Seattle-based, 100% organic latex with wool fire barrier and organic cotton cover. Family-owned.
- Savvy Rest — Virginia-based, customizable organic latex configurations. GOLS, GOTS certifications. Component-by-component disclosure.
- My Green Mattress — Illinois-based, family-owned. GOLS, GOTS, GreenGuard Gold, MADE SAFE certifications. Their Emily Crib Mattress and Kiwi kids' mattress are among the most affordable certified-organic options.
- Birch by Helix — Wool fire barrier, GreenGuard Gold and Fair Trade certified. Hybrid construction with organic cotton cover.
- Earthfoam — All-natural construction with wool fire barrier. Talalay latex, direct-to-consumer, transparent materials disclosure.
- Saatva Classic — Saatva's flagship innerspring uses a wool/cotton fire barrier rather than fiberglass and publishes this in their materials specs. Verify on the specific product page, as some Saatva models use different constructions.
- Brentwood Home Cedar — California-based, plant-fiber-based fire barrier. Certified organic options available within the line.
One thing not to do. Don't trust a third-party "best non-toxic mattress" article that links to brands through affiliate codes. The financial incentive in those rankings doesn't match the disclosure they claim to be doing. Read the manufacturer's own product page and the law tag.
Price reality check
True natural-rubber-and-wool builds run $1,800–$4,000+. Affordable certified-organic options start around $800–$1,200. Below about $400 for a queen, fiberglass becomes very likely because no other fire barrier material is economical at that price point. The federal flammability standard at 16 CFR Part 1633 doesn't specify how a mattress has to achieve flame resistance, and at the lowest price tier, fiberglass is what the math allows. Peer-reviewed
This is not a moral judgment. It's the reality of what the federal flammability standard costs to meet. If $400 is your ceiling, the legitimate options are: accept a fiberglass mattress and never unzip the cover, buy used from a seller who can confirm what's inside, or wait and save until you can move up a tier.
What to do if your mattress does contain fiberglass
Take a breath. A fiberglass-containing mattress with the outer cover intact is not actively releasing fiberglass into your home. The fire sleeve is engineered to stay enclosed. The horror stories all start the same way: someone unzipped the cover.
- Leave the outer zipper cover on. Permanently. Don't unzip to wash. Don't let a cleaning service unzip. Whatever the care instructions say about removing the cover for laundering — ignore them. The cover is the only thing keeping the fiberglass inside.
- For spills, blot from the outside. Damp cloth on the surface of the cover. If the spill is deep enough that you'd need to get underneath, the mattress probably needs replacing rather than salvaging.
- Use a separate, washable mattress protector on top. This is the right way to keep a fiberglass mattress clean. Don't disturb the cover — protect it from above with something you can take off and wash. A good waterproof protector runs $30–$80.
- When you eventually replace the mattress, dispose of it carefully. Don't cut it open. Many cities have mattress recycling programs that handle this properly. If you have to put it out for trash, wrap it in plastic sheeting and tape the seams.
If you sleep on it every night with the cover undisturbed, the practical risk based on what's currently known is low. Almost every documented incident involves cover removal, not normal use.
What to do if you've already removed the cover
This is the worst-case scenario. If you unzipped a cover, exposed a fiberglass sleeve, and there are tiny shiny fibers on your skin or bedding or the floor — here's what to do, in order.
- Don't use a regular vacuum. Standard vacuums redistribute fiberglass through the home and often blow fibers out the exhaust. You need a HEPA-filtered vacuum.
- Don't dry-sweep with a broom. Sweeping aerosolizes the fibers. Use a damp microfiber mop on hard floors and HEPA-vacuum carpets and upholstery instead.
- Wear long sleeves, long pants, gloves, an N95 or P100 respirator, and eye protection while you clean. This is what NIOSH recommends for fiberglass cleanup. The cleanup is genuinely irritating to skin and lungs without protection.
- Bag the affected mattress and bedding in heavy plastic. Don't move anything through the house uncovered. A sleeve that's been disturbed will keep shedding fibers. The mattress itself usually can't be salvaged at this point.
- For severe contamination, hire professional remediation. Several companies now specialize in fiberglass-from-mattress cleanup. If you're documenting the situation for a potential class action claim, photograph everything before cleanup begins.
- Talk to a doctor if you have symptoms. Itching, eye irritation, sore throat, and short-term coughing are documented in the ATSDR toxicological profile and usually resolve once exposure ends.
If you think you have a case worth joining, the active Nectar litigation summary lists plaintiff law firm contacts. We are not lawyers and cannot give legal advice. Documenting everything early is what makes claims provable later.
What the lawsuits actually allege
Nectar (April 2026, ongoing). A proposed class action against Resident Home LLC, Nectar's parent company. It names four models — Classic, Premier, Luxe, Ultra — and the ClassAction.org case summary lays out the allegations: the mattresses contain woven fiberglass fire sleeves, the law tag says "Glass Fiber 23%," and consumers encouraged by Nectar's product materials to remove the cover for cleaning did so — exposing the fiberglass and contaminating their homes. The law tag had the information, but the marketing and product instructions didn't warn plainly about either the fiberglass or the risk of cover removal.
Zinus (2022, settled August 2023). A similar class action made comparable allegations across a broader range of Zinus mattresses. It was dismissed without prejudice after a private settlement. Terms aren't public. Plaintiff attorneys reported representing over 2,000 individuals with claimed injuries.
A class action complaint is not a finding of fact — it's an allegation. What is not contested in any of these cases is the underlying material: fiberglass is in the mattresses; the fight is about disclosure and the resulting harms.
Why fiberglass is in mattresses to begin with
Every mattress sold in the United States must pass a federal flammability test codified at 16 CFR Part 1633, in effect since 2007. The standard doesn't specify how a mattress has to achieve flame resistance. Manufacturers have three real options:
- Chemical flame retardants. Brominated and chlorinated compounds applied to foam or fabric. Effective. Cheap. Several have been linked to documented health concerns — and contribute to how foam off-gasses over time.
- Naturally flame-resistant fibers. Wool, viscose rayon, modacrylic. Effective. More expensive. The default in higher-priced certified-organic mattresses.
- Woven fiberglass. A fire sleeve made of glass fibers. Effective. Cheapest of the three.
Fiberglass is widespread in the under-$400 mattress tier and present in many older mattresses still in use. California has decided to remove this option: AB 1059 bans the sale of mattresses containing textile fiberglass, effective January 1, 2027. New York has introduced a similar bill. The federal CPSC has not announced anything similar.
What the science actually says
The fibers in mattress fire sleeves are technically called synthetic vitreous fibers. The CDC's Agency for Toxic Substances and Disease Registry maintains a public toxicological profile for these fibers. Here's what's actually established: Peer-reviewed
- Short-term exposure causes irritation. Skin itching, eye irritation, sore throat, and upper respiratory irritation are well-documented and reversible once exposure ends.
- Worker cohort studies are mixed. ATSDR notes that workers in factories making fiberglass for home insulation "showed no increased rates of lung problems," while some refractory ceramic fiber workers showed chest x-ray changes.
- The IARC reviewed the evidence in 2002 and reclassified most synthetic vitreous fibers — including the ordinary glass fiber used in mattresses — as Group 3: not classifiable as to carcinogenicity in humans.
In plain terms: working in a fiberglass factory at industrial concentrations is associated with respiratory irritation and possible lung function changes. The hazard of sleeping on a fiberglass mattress with the cover intact is not the same hazard.
The honest gap: there is no peer-reviewed study, that we can locate, of fiberglass exposure specifically from consumer mattress products in household settings. The occupational evidence is the closest available proxy. This is a real limitation in the science. Inferred
Fiberglass is the visible problem. The chemistry is the other one.
Fiberglass is the hazard that announces itself. You can see the splinter, you can clean the contamination, and the fix is concrete: leave the cover on, or buy a mattress that doesn't contain it. That's a real and useful problem to solve. It's also the most visible problem in the same mattress.
The less-visible issue, in the same materials, is the chemistry — the volatile organic compounds that a foam mattress releases throughout its service life, the flame retardants and surfactants that migrate out alongside them, and the combustion-derived compounds that deposit on bedding from cigarette, wildfire, and structure-fire smoke and re-emit for weeks. These don't make headlines because they don't produce visible splinters. They are the part of the picture this publication exists to characterize — see the sleep micro environment framework for the integrative argument that ties the chemistry to the room you actually sleep in.
What we will and will not say
We are not going to claim that any specific mattress in any specific home is harming the people sleeping on it. The available evidence does not support that claim.
What we will say: fiberglass fire sleeves are common in budget-tier mattresses sold in North America, concentrated in the under-$400 price tier and present in many older mattresses still in use. A fiberglass mattress with the cover intact is, by all available evidence, low-risk for routine use. A fiberglass mattress with the cover removed has caused documented home contamination, cleanup costs in the thousands, and short-term symptoms in residents.
The single most useful thing you can do is know what's in your mattress, and not unzip the outer cover if it contains fiberglass. Check the law tag. If it's fiberglass-free, you have no fiberglass-specific concern — though chemistry has other dimensions we cover elsewhere. If it does contain fiberglass, leave the cover on, use a separate washable protector on top, and you have substantially eliminated the practical risk. If you're shopping for a new mattress and want to avoid fiberglass entirely, the list of brands with documented disclosure above is the place to start.
Frequently asked questions
What mattress brands are fiberglass-free?
Brands with documented disclosure confirming no fiberglass include Avocado, Naturepedic, Obasan, Soaring Heart, Savvy Rest, My Green Mattress, Birch by Helix, Earthfoam, Saatva Classic, and Brentwood Home Cedar. The certifications that reliably exclude fiberglass are GOTS, GOLS, and MADE SAFE. CertiPUR-US is foam-only and does not address the fire barrier, so a CertiPUR-US-certified mattress can still contain fiberglass. See the full brand list above for price tiers.
How do I find a fiberglass-free mattress without spending $4,000?
The most affordable certified-organic options start around $800–$1,200 for a queen — My Green Mattress, Birch by Helix, Earthfoam. In the $600–$1,200 tier, Saatva Classic and Brentwood Home Cedar use non-fiberglass fire barriers without full organic certification. Below $400 for a queen, fiberglass is very likely because no other fire barrier material is economical at that price point.
Does the Nectar mattress contain fiberglass?
Yes. According to a 2026 class action lawsuit, several Nectar models — Classic, Premier, Luxe, and Ultra — contain a woven fiberglass fire sleeve. The law tag lists Glass Fiber at approximately 23% of total fill. The suit alleges Nectar's product materials encouraged cover removal for cleaning without adequately warning consumers about the fiberglass inside.
How do I know if my mattress has fiberglass?
Find the law tag sewn into the side seam and look for "glass fiber," "fiberglass," or "silica fiber" in the fill list. These terms all refer to the same material. If present, do not remove the outer cover under any circumstances. You can also check NapLab's database of 395 mattresses analyzed for fiberglass content.
What happens if you unzip a mattress with fiberglass?
Removing the outer cover releases glass fibers into the home, contaminating bedding, carpets, furniture, and HVAC systems. Cleanup requires a HEPA-filtered vacuum, protective gear including an N95 respirator per NIOSH guidance, long sleeves, gloves, and eye protection. In severe cases, professional remediation is necessary.
Is fiberglass in mattresses dangerous?
The ATSDR toxicological profile for synthetic vitreous fibers documents skin irritation, eye irritation, and upper respiratory irritation as well-established short-term effects. The IARC classified ordinary glass fiber as Group 3 — not classifiable as to carcinogenicity in humans — in its 2002 review. A fiberglass mattress with the cover intact presents low practical risk. The documented harms almost universally involve cover removal.
Which mattress brands use fiberglass?
Fiberglass is common in budget-tier mattresses sold in North America, concentrated in the under-$400 price tier. Brands named in lawsuits include Nectar (class action filed April 2026) and Zinus (settled August 2023). Check the law tag on any specific mattress.
Will fiberglass mattresses be banned?
California passed AB 1059 banning the sale of mattresses containing textile fiberglass, effective January 1, 2027. New York has introduced similar legislation. The federal CPSC has not announced a nationwide ban as of 2026.
Is Zinus fiberglass still a problem?
Zinus settled a class action over fiberglass exposure in August 2023, but fiberglass was not removed from their entire product line — only specific older models were addressed in the settlement. Newer Zinus models may still contain fiberglass. Check the law tag on any specific Zinus mattress before unzipping the cover.
Citations
- ClassAction.org. "Nectar Mattresses Can Leak Toxic Fiberglass, Class Action Lawsuit Alleges." April 23, 2026. classaction.org
- ClassAction.org. "Class Action Claims Zinus Mattresses Can Expel Fiberglass." Settled August 2023. classaction.org
- Code of Federal Regulations, Title 16, Part 1633. Federal Flammability Standard. ecfr.gov
- California Department of Public Health. Factsheet on Fiberglass and Mattresses. cdph.ca.gov
- Sleep Products Association. "Bill to Ban Mattresses That Contain Fiberglass Introduced in New York." April 2025. sleepproducts.org
- Agency for Toxic Substances and Disease Registry (ATSDR). Toxicological Profile for Synthetic Vitreous Fibers. atsdr.cdc.gov
- NIOSH. Fibrous Glass — About. March 2026. cdc.gov
- NapLab. List of Mattresses With Fiberglass — 395 Mattresses Analyzed. March 2026. naplab.com
- Global Organic Textile Standard (GOTS) — current criteria for textile certification.
- Global Organic Latex Standard (GOLS) — current criteria for latex certification.
- MADE SAFE Hazard List — current screened-out ingredients including textile fiberglass.
- GreenGuard Gold — current emissions criteria.
- CertiPUR-US — current certification scope (foam only).
- International Agency for Research on Cancer (IARC). Monograph 81 (2002). Synthetic vitreous fibers.
- Chen C-H et al. (2020). Respiratory health effects of the fiberglass-reinforced plastic lamination process. Scandinavian Journal of Work, Environment and Health.
- Boskabady MH et al. (2013). Assessment of health effects related to fiber glass exposure in production workers. Iranian Journal of Public Health.