Zinus 12-inch Green Tea memory foam mattress

Zinus is a long-listed brand in this exact size and height, and the reason this particular mattress earns a place is one line most competitors leave out: it states fiberglass-free explicitly. That sounds like a small thing and it is not, so it gets its own section below. Beyond that it is a familiar proposition — 12 inches of memory foam with cooling gel, medium firmness, certified safe foams and fabric — and it is the priciest of the three foam queens we track.

1 · Fiberglass-free, stated

Zinus 12 Inch Green Tea Cooling Memory Foam Mattress

Publishes fiberglass-free explicitly, which is worth more than it sounds if a mattress cover ever gets removed for washing.

Height

12 in

Our spec score

8.0/10

Best for

Fiberglass-free, stated

$299.99 · Check price

As of August 7, 2026. #ad How we’re funded

What works

• Fiberglass-free is published, not implied. Fiberglass in a fire barrier is only a problem if the cover comes off, and covers do come off
• Cooling gel foam, published
• A brand with a long listing history in this exact size and height

What doesn’t

• No explicit adjustable-base compatibility statement
• Medium firmness with no scale behind it
• The most expensive of the three mattresses here

Published specifications

Published specifications for the Zinus 12 Inch Green Tea Cooling Memory Foam Mattress

Height	12 inches
Construction	Memory foam with cooling gel
Firmness	Medium
Fiberglass	Fiberglass free (stated)
Certification	Certified safe foams and fabric
Adjustable-base rated	Not published

Read from the product listing on 2026-07-23. Blanks are specifications the manufacturer does not publish, not figures we could not be bothered to find.

How the score was reached

Rubric breakdown for the Zinus 12 Inch Green Tea Cooling Memory Foam Mattress

Height and stack planning12-inch height published; full dimensions are not.	8
Base compatibilityAll-foam construction flexes; no explicit adjustable-base rating.	8
Firmness disclosureMedium stated, no measured scale.	7
CertificationFiberglass-free plus certified safe foams and fabric published.	9
Mean, rounded to one decimal	8.0

The fiberglass-free point, and why it matters

Every mattress sold in the US must meet a federal open-flame flammability standard. One common and cheap way manufacturers meet it is a fiberglass fire barrier sewn inside the cover. That is fine while the cover stays on — and a genuine problem if anyone ever unzips and removes the cover, because disturbed fiberglass is miserable to clean up and gets everywhere. A mattress that states fiberglass-free is telling you it met the same legal standard by some other means, which matters precisely because covers do come off for washing.

So the Zinus is not safer in the fire it is designed to survive — every mattress on the market meets that standard. It is safer to live with if the cover ever comes off, which is the realistic scenario for anyone who wants to wash bedding thoroughly. That is a modest, real advantage, stated plainly rather than dressed up.

The case for it

Beyond the fiberglass statement, the arguments are the ordinary ones. All-foam construction flexes on an adjustable base where a rigid innerspring often will not. The cooling-gel foam is aimed at the heat that dense memory foam is known for — it will not make a hot sleeper cold, but it addresses the problem rather than ignoring it. And it comes from a brand with a long listing history in this size, which is a weak signal but a real one: a mattress that has been sold in volume for years has a service record behind it that a brand-new entry does not.

The height it will give you

Like the EGOHOME, this is 12 inches, and on this site that is a height decision first. Your sleep surface sits at the base or frame height plus 12 inches, and that total is what determines whether standing up is easy or a struggle. The one planning wrinkle here is that Zinus publishes the 12-inch height but not the full length-and-width dimensions, so if you are matching it to a specific frame, that is a measurement to confirm. Add the 12 inches to your frame, check it against your target, and decide from the number.

The case against it

Three reservations, honestly. It does not state adjustable-base compatibility explicitly — we infer flex from the all-foam build, which is sound, but it is our inference and not the maker's assurance, so ask the seller if the base is the point. Medium is a manufacturer's word with no scale behind it, so it tells you a direction and not much more. And it is the most expensive of the three foam queens we track — a real cost to weigh against the fiberglass-free advantage that justifies it.

What we could not verify

• Full length and width. The 12-inch height is published; the complete dimensions are not, so confirm them if you are matching a frame.
• Adjustable-base compatibility as an explicit claim. Inferred from the all-foam construction, not stated. Test it yourself.
• Edge support. Not published by any mattress listing, and it is what decides how easy standing up is. Why it matters.
• How firm medium really is. No measured scale, and not comparable to anyone else's medium.
• Durability, warranty and shipping weight. None published to a standard we would repeat, and the mattress will still arrive as a heavy boxed parcel — handling it.

How it compares to the EGOHOME

The two sit close together and split on disclosure. The EGOHOME publishes its full dimensions to the inch and CertiPUR-US, which makes stack planning cleaner and is why we rank it first overall. The Zinus answers a different question better — the fiberglass-free statement — and adds cooling gel, at a higher price and without the full dimensions. Both are all-foam, both flex, and neither states base compatibility. If your worry is planning the exact height, lean EGOHOME; if it is a cover you intend to wash, lean Zinus.

Where it might not suit you

The same two cautions that apply to any 12-inch all-foam mattress apply here, plus one of its own. If a soft edge is your real obstacle to getting up, foam is the construction least likely to solve it, and a reinforced hybrid perimeter is the fix — the foam-versus-hybrid comparison explains why. If your base already sits tall, 12 inches on top may overshoot your target height. And the one specific to this model: it is the most expensive of the three foam queens we track, so if the fiberglass-free statement is not something you will act on — if you never intend to remove the cover — you may be paying a premium for reassurance you will not use. The cheaper Yaheetech carries a no-fiberglass statement too, at a lower tier.

Who should buy it

Someone who wants an all-foam mattress for a base and specifically values the fiberglass-free statement — realistically, anyone who intends to remove and wash the cover, or who has been unsettled by fiberglass stories and wants the worry off the table. If the exact finished height and full dimensions matter more to you, the EGOHOME is the cleaner planning choice; if the lowest price that still carries both certifications is the priority, the Yaheetech is the value pick. Whatever you land on, add deep-pocket sheets so the first fold of the base does not strip a corner.