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Cozey Hybrid Mattress: Coils, Edge Support and Sizes

A plain guide to our Hybrid Mattress: what is inside its 12-inch build, how many coils each size has, how the foam edge rail works, and the sizes, trial and warranty.

Updated November 9, 20267-min ReadCozey Editorial
A Cozey hybrid mattress

Short answer: Our Cozey Hybrid Mattress is a 12-inch (30.5 cm) medium-firm mattress with 6 inches of zoned coils under a 2-inch Serene® comfort layer. It comes in Full, Queen and King, with a 100-night trial and a 15-year limited warranty.

It has 513 coils in a Full, 638 in a Queen and 812 in a King, plus a high-density foam rail around the coils so the edge holds up when you sit on it. We built the Hybrid for people who want more bounce, more airflow and firmer edges than an all-foam bed gives. This guide stays on the Hybrid itself. If you are still deciding between coils and foam, our guide to choosing between the Cozey Foam and Hybrid mattresses compares them side by side.

On This Page

  1. What is inside the Cozey Hybrid Mattress?
  2. How many coils does it have, and how do they work?
  3. What is the foam edge rail?
  4. How tall is it, and what sizes do we offer?
  5. How firm is it, and who is it for?
  6. What base does it need, and how do you set it up?
  7. Our recommendation
  8. Explore our bedroom range

What is inside the Cozey Hybrid Mattress?

A quilted polyester cover (a 390 GSM top panel and a 180 GSM border) sits over five layers. Each one has a job.

What is inside the Cozey Hybrid Mattress?

Layer (top to bottom)ThicknessWhat it does
Comfort layer: Serene® foam2 inches (5 cm)The layer you feel first. It contours to shoulders and hips and eases pressure.
Transition layer: high-density foam2 inches (5 cm)Firmer than the comfort layer, so you move into support gradually.
Coil layer: zoned coils6 inches (15 cm)The core. It gives the bed its bounce and lets air move through the mattress.
Foam edge rail: high-density foam3 x 6 inches (7.6 x 15 cm)A border around the coils that keeps the sides firm.
Base layer: high-density foam1 inch (2.5 cm)A stable bottom for the coils to sit on.

Serene® is a polyurethane comfort foam developed by Carpenter Co. It feels close to memory foam, but it is a different material, and we do not call it a cooling foam. Our guide to Serene foam and memory foam explains the difference and where Serene falls short. The foams in the mattress are CertiPUR-US® compliant, and the mattress is made in Canada.

How many coils does it have, and how do they work?

The coil count depends on the size: 513 in a Full, 638 in a Queen and 812 in a King. The coils are individually wrapped, so each one moves on its own instead of pulling its neighbours along. That is why the bed responds where you press and stays quieter than an older spring mattress.

The coil layer is also what makes the Hybrid sleep differently from our Foam Mattress. Six inches of coils leave open space inside the mattress, so heat has somewhere to go. You also sit a little higher in the bed and roll over with less effort.

Our product page describes the coils as zoned. We do not publish a zone count or map for the Canadian build, so we leave it at that.

What is the foam edge rail?

The edge rail is a 3 x 6 inch (7.6 x 15 cm) border of high-density foam that surrounds the coil layer. Its job is to keep the edge from collapsing when you sit on it.

With the rail, you can sit on the side to put on socks without sliding off. It is the main reason we recommend the Hybrid over the Foam Mattress for anyone who sits on the edge often. The foam edge of our Foam Mattress is standard, so it softens more under a seated person.

How tall is it, and what sizes do we offer?

The Hybrid is 12 inches (30.5 cm) tall in every size, 2 inches taller than our 10-inch Foam Mattress. Look for fitted sheets with pockets of at least 12 inches. Our sizes measure about half an inch under the rounded standard sizes, which is normal for foam and hybrid mattresses.

How tall is it, and what sizes do we offer?

SizeWidth x length x heightCoilsBox weightFrom (CAD)
Full52.5 x 74.5 x 12 inches (133.4 x 189.2 x 30.5 cm)51359 lb (27 kg)$850
Queen59.5 x 79.5 x 12 inches (151.1 x 201.9 x 30.5 cm)63870 lb (32 kg)$895
King75.5 x 79.5 x 12 inches (191.8 x 201.9 x 30.5 cm)81286 lb (39 kg)$1,095

Prices are the ones shown on our product page. Each mattress ships rolled in a single box of 44 x 18.5 x 18.5 inches (112 x 47 x 47 cm), whatever the size, so it fits through apartment doors and stairwells. Two people make a Queen or King easier to carry up stairs. A 12-inch bed also sits higher on a low frame, so our guide to the best mattress for a low-profile or platform bed helps you check the height.

How firm is it, and who is it for?

The Hybrid is medium-firm, about 6 to 6.5 out of 10, roughly half a point firmer than our Foam Mattress. It is soft enough on top to take pressure off shoulders and hips and supportive enough underneath to keep the lower back from sagging. Our guide to mattresses for side and back sleepers explains what each position needs.

It tends to suit:

  • Hot sleepers. The open coil layer gives heat more room to escape than a solid foam core.
  • Combination sleepers. The bounce makes changing positions easier.
  • People who sit on the bed. The foam rail keeps the edge firm.
  • Stomach sleepers on the lighter side. The bed holds the hips a little higher.

It is a weaker fit if you want the deepest sink and the least motion transfer, because our Foam Mattress absorbs more movement. It is rated for up to 250 lb (113 kg) per sleeper, and above that most people get better long-term support from a thicker or firmer mattress.

What base does it need, and how do you set it up?

A solid platform, a slatted base with gaps no wider than 3 inches (7.6 cm), a box spring or the floor all work. Queen and King sizes need centre support. On our Ara bed, the mattress rests directly on the slats. Our guide on whether the Ara works with your mattress covers thickness and slat spacing.

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

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

2. Use the bag cutter to open the wrap, then unroll the mattress flat on your base.

3. Carefully cut the plastic bag and slide it off.

4. Give it 24 to 48 hours to reach full shape. It is usually ready to sleep on after about 30 minutes.

The cover is spot clean only and is not machine washable, so a mattress protector is worth having. Rotate the mattress head to foot every four to six months, and do not flip it.

Our recommendation

Choose the Hybrid if you sleep hot, move around at night, or sit on the edge of the bed. Choose our Foam Mattress if a still, cradling feel matters more to you. If your frame is low, measure first, since the Hybrid is the taller of the two.

Explore our bedroom range

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

Frequently Asked Questions

The coil count depends on the size. Our Full has 513 coils, our Queen has 638 and our King has 812. The coils are individually wrapped and sit in a 6-inch (15 cm) layer, so each one moves on its own. That gives the mattress its bounce and lets air move through the core. That layering is why the Hybrid feels livelier than our Foam Mattress. Our product page describes the coil layer as zoned.


The edge rail is a 3 x 6 inch (7.6 x 15 cm) border of high-density foam that surrounds the coil layer. It keeps the edge from collapsing when someone sits on the side of the bed, so it stays firm for putting on socks or getting up. Our Foam Mattress has a standard foam edge, which softens more, so the Hybrid is the better pick for edge sitters, including anyone who sits on the bed to get dressed or reads upright against the headboard.


The Hybrid is 12 inches (30.5 cm) tall in every size, which is 2 inches taller than our 10-inch Foam Mattress. That height is worth checking against your frame, because a thicker mattress raises the sleeping surface and covers more of the headboard. Use fitted sheets with pockets of at least 12 inches. On a low platform frame, measure from the top of the base to the top of the side rail to see how much of the mattress will rise above it.


We offer the Hybrid in Full, Queen and King. The Full measures 52.5 x 74.5 inches (133.4 x 189.2 cm), the Queen 59.5 x 79.5 inches (151.1 x 201.9 cm) and the King 75.5 x 79.5 inches (191.8 x 201.9 cm), all 12 inches (30.5 cm) tall. Our sizes run about half an inch under the rounded standard sizes, and standard sheets fit without any issue. Our product page lists the Full from $850, the Queen from $895 and the King from $1,095.


It is medium-firm, around 6 to 6.5 out of 10, which makes it roughly half a point firmer than our Foam Mattress. The 2-inch Serene® layer on top lets shoulders and hips sink in a little, while the coils and foam beneath keep your spine aligned. We made one firmness on purpose, because it is the feel most people prefer. If you know you need a very soft or very firm bed, this is not the right mattress, and it is rated for up to 250 lb (113 kg) per sleeper.


Yes for both. Serene® does not hold heat the way traditional memory foam does, and the open space in the 6-inch coil layer gives heat somewhere to go, so it is the one we suggest if you often wake up warm. For side sleepers, the 2-inch comfort layer takes pressure off the shoulder and hip, and the medium-firm support keeps the waist from dropping. We do not call Serene a cooling foam.


You have 100 nights to try it. If it is not the right fit, contact us and we schedule a free pickup and give a full refund, with no minimum number of nights and no need for the original box. The mattress also carries a 15-year limited warranty against manufacturing defects, including a visible, permanent indentation of 1 inch (2.5 cm) or more. Normal softening and changes in comfort preference are not covered, and the mattress needs a proper base, as our warranty page explains.


No. A solid platform, a slatted base with gaps no wider than 3 inches (7.6 cm), a box spring or the floor all work. Queen and King sizes need centre support. On our Ara bed, the mattress rests directly on the slats, so you do not add a box spring. Because the Hybrid is 12 inches tall, it sits higher on a low frame than our Foam Mattress, so check how much of the headboard it will cover before you order.

Explore Cozey's Ara Bed

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