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Cozey Foam Mattress: Layers, Firmness and Sizes

A plain guide to our Foam Mattress: what is in each of its three layers, how firm it feels, the sizes we make, and how the trial, warranty and setup work.

Updated November 9, 20266-min ReadCozey Editorial
A Cozey foam mattress on a bed

Short answer: Our Cozey Foam Mattress is a 10 inch, all-foam, medium-firm mattress with no coils. It comes in Full, Queen and King with a 100-night trial and a 15-year limited warranty.

It has 2 inches of Serene® comfort foam on top, 2 inches of high-density transition foam in the middle and 6 inches of high-density support foam underneath, and its firmness is about 5.5 to 6 out of 10. We designed it for people who want a close, cradled feel and a bed that stays still when a partner moves. It ships rolled in one box, so it is easy to get through a stairwell or an elevator. This guide stays on the Foam Mattress itself. If you are weighing foam against coils in general, our foam vs hybrid mattress guide covers the difference.

On This Page

  1. What is in each layer of the Cozey Foam Mattress?
  2. How firm is it, and who is it for?
  3. What sizes does the Foam Mattress come in?
  4. How do you set it up and look after it?
  5. What are the trial, warranty and durability details?
  6. Our recommendation
  7. Explore our bedroom range

What is in each layer of the Cozey Foam Mattress?

Under a quilted polyester cover (a 390 GSM top panel and a 180 GSM border), the mattress is built from three foam layers. Each one has a job.

What is in each layer of the Cozey Foam Mattress?

Layer (top to bottom)ThicknessWhat it does
Comfort layer: Serene® foam2 inchesThe layer you feel first. It contours to your body and eases pressure at the shoulders and hips.
Transition layer: high-density foam2 inchesFirmer than the comfort layer, so you move into support gradually.
Support layer: high-density foam6 inchesThe firmest layer. It keeps your spine aligned and stops your hips from sinking too far.

Serene® is a polyurethane comfort foam developed by Carpenter Co. It feels close to memory foam, but it is a different material that is not temperature-sensitive. Every foam in the mattress is CertiPUR-US® certified, which means it is tested for formaldehyde, heavy metals, phthalates and low VOC emissions. The mattress also passes the U.S. mattress flammability standards, 16 CFR 1632 and 16 CFR 1633.

How firm is it, and who is it for?

The Foam Mattress is medium-firm, around 5.5 to 6 out of 10. Because the core is dense foam, your weight is absorbed evenly, so you settle into the bed rather than lying on top of it. There is very little bounce and no noise.

It tends to suit:

  • Side and back sleepers. The Serene® layer gives shoulders and hips room to sink, and the support foam keeps your lower back from sagging.
  • Couples. The foam core absorbs movement where it starts, so a partner getting up early is less likely to wake you.
  • People who want a low bed. At 10 inches it keeps the bed profile low.

It is a weaker fit in a few cases. It comes in one firmness, so it is not the right pick if you know you need a soft or very firm bed. It is rated for up to 250 lb per sleeper, and above roughly 230 to 250 lb most people get better long-term support from a thicker or firmer mattress. If you sleep very hot, remember that a solid foam core breathes less than open coils.

What sizes does the Foam Mattress come in?

The Foam Mattress comes in three sizes, all 10 inches tall. Each one measures about half an inch under the rounded standard size, which is normal for foam mattresses, and standard fitted sheets fit.

What sizes does the Foam Mattress come in?

SizeWidth x length x heightBox weight
Full52.5 x 74.5 x 10 inches52 lb
Queen59.5 x 79.5 x 10 inches62 lb
King75.5 x 79.5 x 10 inches72 lb

The box is the same size for all three: 44 x 17.5 x 17.5 inches, with a built-in handle. Plan on two people to carry a Queen or King upstairs. Our page lists starting prices from $695 for a Full, and we offer free shipping. If you are measuring a route into your home, our guide to measuring stairs, elevators and doorways helps.

How do you set it up and look after it?

Setup takes a few minutes of work and a short wait:

1. Bring the box into the bedroom before opening it.

2. Unroll the mattress flat on your bed base.

3. Cut the plastic with the included bag cutter and slide it off.

4. Give it about 30 minutes before you sleep on it. It reaches its full shape within 24 to 48 hours.

A new-foam smell is normal for the first day or two and fades with some airflow.

For care, rotate the mattress head to foot every four to six months and do not flip it, because it is built to be slept on one side only. The cover is spot clean only and is not machine washable, so a mattress protector is the easiest way to keep it fresh.

On our Ara bed the mattress sits directly on the slats with no box spring needed. For another platform bed, follow that frame's instructions. Our guide on whether the Ara works with your mattress covers thickness and slat spacing, and our guide to mattresses for a low-profile or platform bed covers height.

What are the trial, warranty and durability details?

  • 100-night trial. If it is not the right fit, contact us and we will schedule a free pickup and give a full refund. There is no minimum number of nights and you do not need the original box.
  • 15-year limited warranty. It covers manufacturing defects, including a visible, permanent indentation of 1 inch or more on proper support. Normal softening and changes in comfort preference are not covered.
  • Durability testing. In our testing, which simulates 15 years of nightly use, the Foam Mattress softened by less than 6%.
  • Made in Canada. It is made in Canada and designed by our team in Montreal.

Our recommendation

  • You want a cradled, quiet bed, or you share a bed with a restless sleeper: the Foam Mattress.
  • You sleep on your side or back and want medium-firm support: the Foam Mattress.
  • You weigh more than 250 lb or need a soft or very firm bed: this mattress is not the right fit.

Explore our bedroom range

Product specifications can change. Check the current dimensions on the product page before ordering.

Frequently Asked Questions

Our Foam Mattress is 10 inches tall and has no coils. Under a quilted polyester cover, it has 2 inches of Serene® comfort foam, 2 inches of high-density transition foam and 6 inches of high-density support foam. The comfort layer contours to your body, the transition layer eases you into support, and the support layer keeps your spine aligned. Every foam is CertiPUR-US® certified, and standard fitted sheets fit because the mattress is the same width and length as a standard size less about half an inch.


It is medium-firm, around 5.5 to 6 out of 10. The dense foam core spreads your weight evenly, so you settle into the bed instead of sitting on top of it. We chose medium-firm because it is the feel most people prefer, and it suits side and back sleepers well. It comes in one firmness only, so if you already know you need a soft or very firm bed, this mattress is not the right pick for you.


No. The comfort layer is Serene® foam, a polyurethane foam developed by Carpenter Co. that feels close to memory foam but is a different material, built with microscopic air capsules. In the supplier's lab tests on 2 inch foam samples, Serene® rebounded about four times faster than memory foam, so turning over takes less effort, and it showed no detectable temperature sensitivity, so it does not firm up in a cold bedroom. These figures describe the foam on its own, not the finished mattress.


Yes. The Foam Mattress comes with a 100-night trial. If it is not right, we schedule a free pickup and give a full refund, with no minimum number of nights and no need for the original box. It also has a 15-year limited warranty against manufacturing defects, including visible, permanent indentations of 1 inch or more on proper support. Normal softening and changes in comfort preference are not covered, and the mattress needs a proper base to keep the warranty valid.


No. On our Ara bed, the mattress rests directly on the slats, so you do not add a box spring. For another platform bed, follow that frame's instructions, and make sure the slats are solid and close together, because wide gaps leave a foam mattress unsupported. Queen and King sizes need center support. We do not state compatibility with adjustable bases, so ask our Customer Happiness team before pairing the mattress with one, or with a specific foundation you already own.


Yes. The high-density foam core absorbs movement where it starts, with very little bounce and no noise, so a partner getting up at 5 a.m. is less likely to wake you. It suits couples where one person is a light sleeper or the other tosses and turns. Because Serene® is not temperature-sensitive and a solid foam core breathes less than open coils, couples who both run very warm may want to think about that trade-off before choosing an all-foam bed.


The Foam Mattress is rated for up to 250 lb per sleeper. Above roughly 230 to 250 lb, most people get better long-term support from a thicker or firmer mattress, and we would rather you buy the right bed than return ours. The cover is spot clean only and is not machine washable, so treat spills with a damp cloth and mild soap and consider a mattress protector. Rotate the mattress every four to six months, and do not flip it.

Explore Cozey's Ara Bed

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