Every US mattress must pass federal flammability tests. Here are the barrier materials brands use, why fiberglass became a problem, and our documented brand-by-brand status.
Federal rules require every mattress sold in the United States to pass flammability performance testing — a cigarette-ignition test and an open-flame test. The rules specify performance, not materials, so each manufacturer chooses how to meet them. That choice is what shoppers are really asking about when they ask about fiberglass.
| Barrier approach | How it works | Practical notes |
|---|---|---|
| Wool | Naturally flame-resistant protein fiber, often quilted into the cover | Common on organic beds; adds cost and some moisture management |
| Silica-based / hydrated silica fabrics | Mineral fabric that chars rather than sustaining flame | Widely used as a fiberglass alternative; usually sewn as a sock |
| Inherently FR fibers (e.g. treated rayon, modacrylic blends) | Fibers engineered to resist ignition without added surface chemicals | Most common in current bed-in-a-box builds |
| Plant-based barriers | Thistle pulp and similar cellulose barriers | Used by some brands as a documented alternative |
| Fiberglass-containing sock | Woven glass-fiber fabric under the cover | Meets the rule inexpensively; a torn cover can release fibers into a home |
| Chemical flame retardants | Treatments applied to fabric or foam | Less common in mattresses now than a decade ago; many brands publish that they avoid them |
What the law requires
Two federal standards apply: one addressing cigarette ignition of the mattress surface and one addressing open-flame performance of the mattress and foundation set. Both are performance tests, verified by the manufacturer’s testing and record-keeping obligations. Nothing in either standard requires fiberglass, wool, or any specific material — which is why identical compliance can sit behind very different builds.
Why fiberglass became the issue
Some mattresses use glass fibers in a fire barrier. Fibers can escape when a cover is removed or damaged and may spread to nearby surfaces. California’s health department describes potential skin, eye and breathing irritation from released fibers. Do not open or disturb a cover to investigate; check the manufacturer’s instructions and ask about the exact product.
How to find out what is in your mattress
Check the law tag for fiber information, including terms such as “glass fiber,” and ask the manufacturer in writing about the exact model and production date. A tag may not identify every component or the fire barrier, so the absence of a term is not proof that the mattress is fiberglass-free. A published brand statement may apply only to particular products or dates. If the manufacturer cannot confirm the relevant model, treat its barrier material as unknown.
Should you avoid fiberglass?
If avoiding fiberglass is important to you, ask for confirmation for your exact model and purchase date. Follow the manufacturer’s instructions before removing any cover: some are designed to be washable, while others must remain in place. The California Department of Public Health notes that fibers can escape when a cover is removed or damaged.
What to do if you suspect fibers have escaped
Stop disturbing the mattress and contact the manufacturer for product-specific handling guidance. California’s health department advises covering the mattress before moving it to reduce the spread of glass fibers. Its fiberglass and mattresses fact sheet provides further information. If you have persistent skin, eye or breathing symptoms, seek advice from a healthcare professional.
Questions to send the manufacturer
- What is the fire-barrier material in this exact model, size and production date?
- Does any part of the mattress contain glass fiber, and does the answer differ for older versions?
- Is the outer cover intended to be removed and washed? Which care instructions apply?
- If the cover is damaged, what handling and warranty steps do you recommend?
Keep the written response with your order records. A foam certification or a broad “natural” claim does not by itself answer these questions.
Where certifications fit
No certification in the certifications hub certifies “fiberglass-free” as such. CertiPUR-US covers foam, not barriers. GREENGUARD Gold measures emissions. GOTS may cover a wool barrier because wool is a textile fiber. So a fiberglass answer almost always comes from the brand or the law tag, not a logo.
Brand fiberglass database
The following rows summarize prior brand statements and other documented records. They are starting points, not a guarantee for every model or production date. Open the linked source and confirm the exact mattress with the manufacturer. “Not disclosed” means this table does not document an answer; it does not mean the mattress contains fiberglass.
10 brands documented fiberglass-free · 6 awaiting a citable statement · 16 brands tracked.
| Brand | Status | Barrier material | Evidence type | Source |
|---|---|---|---|---|
| Avocado | Documented fiberglass-free | Organic wool or charcoal-infused latex | Brand published statement | Brand source |
| Bear | Documented fiberglass-free | GREENGUARD Gold certified fiberglass-free fire barrier | Brand published statement | Brand source |
| Big Fig | Documented fiberglass-free | Fiberglass-free fire barrier | Brand published statement | Brand source |
| Birch | Not disclosed | — | Not disclosed | — |
| Brooklyn Bedding | Documented fiberglass-free | Non-woven hydrated silica, rayon and polyester barrier | Brand published statement | Brand source |
| DreamCloud | Not disclosed | — | Not disclosed | — |
| GhostBed | Not disclosed | — | Not disclosed | — |
| Helix | Documented fiberglass-free | Rayon-based fire barrier, according to Helix; confirm the exact model | Brand published statement | Brand source |
| Leesa | Not disclosed | — | Not disclosed | — |
| Naturepedic | Documented fiberglass-free | Organic wool, no added flame barrier | Brand published statement | Brand source |
| Nectar | Not disclosed | — | Not disclosed | — |
| Nest Bedding | Documented fiberglass-free | Hydrated silica barrier; wool in latex models | Brand published statement | Brand source |
| Nolah | Documented fiberglass-free | Fiberglass-free barrier; organic wool in Natural and Nurture | Brand published statement | Brand source |
| Purple | Not disclosed | — | Not disclosed | — |
| Saatva | Documented fiberglass-free | Plant-based thistle pulp, Paladin poly/rayon blend, or organic New Zealand wool | Brand published statement | Brand source |
| WinkBeds | Documented fiberglass-free | Cotton and rayon blend barrier; natural wool in EcoCloud | Brand published statement | Brand source |
For specific models we can document, with our measured test scores attached, see Best Fiberglass-Free Mattresses. If your brand is listed as not disclosed, ask them in writing for the fire-barrier material by name and read the law tag’s fiber content list.
Related guides
Back to the Mattress Certifications & Safety guide.
Frequently asked questions
Do all mattresses contain fiberglass?
No. Federal flammability rules specify performance, not materials, and many brands use wool, silica-based fabric, plant-based barriers or inherently flame-resistant fibers instead.
How do I know if my mattress has fiberglass?
Check the law tag and ask the manufacturer about the exact model and production date. A label may not identify every component. Do not unzip the cover to inspect it.
Is fiberglass in a mattress dangerous?
Fibers can escape if a cover is removed or damaged and may irritate skin, eyes or airways. Follow the manufacturer’s instructions and do not open a cover merely to inspect the barrier.
Can I remove my mattress cover to wash it?
Only if the manufacturer says so explicitly. Many law tags warn against it, and removing a cover over a glass-fiber barrier can contaminate a home.
Are chemical flame retardants still used in mattresses?
They are far less common in mattresses than they once were, and many brands publish statements that they use none. Ask for that statement in writing.
Sources
- 16 CFR Part 1632 (cigarette ignition)
- 16 CFR Part 1633 (open-flame)
- CPSC mattress flammability business guidance
- Global Organic Textile Standard (GOTS)
Certification descriptions reflect each program’s published requirements at the time of writing; programs update their criteria, so verify a current certificate before purchase. Yawnder does not issue or administer any certification.