Full Bed Mattress Guide: Sizes, Types, and Best Options in Canada

A full bed mattress measures 54 inches wide by 75 inches long. That is the same size as a double mattress. Full and double are two names for the same thing. If you have been searching for a "costco double bed mattress" or a "full bed mattress" and wondering whether they are different products, they are not. The terms are interchangeable. What matters is whether 54 by 75 inches is the right size for your body, your bedroom, and your sleeping situation. Brad, who has owned Mattress Miracle in Brantford since 1997, says the full/double is the most misunderstood mattress size in Canada. People either overestimate what it can do for two sleepers or underestimate what it offers a single sleeper. This guide covers everything you need to know before buying one.

Full/Double Mattress Dimensions Explained

The standard full mattress in Canada measures 54 inches wide by 75 inches long. In metric, that is 137 centimetres by 191 centimetres. The depth varies by model and typically ranges from 8 inches to 14 inches depending on the construction and comfort layers.

Here is how the full/double compares to other standard Canadian mattress sizes:

The full/double gives you 16 more inches of width than a twin. That is significant for an adult who moves around at night. But it is 6 inches narrower and 5 inches shorter than a queen. Those 11 inches make a meaningful difference if two people share the bed.

A full/double mattress split down the middle gives each person 27 inches of sleeping width. A standard baby crib mattress is 27.25 inches wide. That comparison usually settles the "can two adults share a double?" question quickly. For more on how a full mattress compares to a double, we have a detailed breakdown.

Who Should Choose a Full/Double Mattress

The full/double mattress occupies a specific niche. It is not the cheapest option (twins are), and it is not the most versatile (queens are). But for certain situations, it is exactly right.

Single adults in smaller bedrooms. If your bedroom is between 10 x 10 and 10 x 12 feet, a full mattress gives you room for nightstands and a dresser while still offering comfortable sleeping width. A queen in the same room leaves you squeezing past furniture.

Teenagers transitioning from a twin. A twin gets small fast for a growing teenager. The full gives them 16 additional inches of width without requiring a bedroom renovation. It also fits the same bed frame if the frame is adjustable.

Guest rooms. A guest room with a full/double mattress accommodates most single visitors comfortably and can work for a couple staying a night or two. It leaves more floor space than a queen for a pull-out desk, luggage rack, or reading chair.

Studio apartments and small condos. In Toronto, Hamilton, or Kitchener condos where square footage is expensive, a full mattress frees up living space. Some condo bedrooms in newer builds are designed around full/double dimensions, not queen.

RVs and cottages. Many RV sleeping areas and cottage bedrooms are built for full/double mattresses. Trying to fit a queen in these spaces often means removing or rearranging other furniture.

Who should NOT choose a full/double: Two adults who share a bed every night. Sleepers taller than 6 feet. Anyone who sleeps with a large dog. Restless sleepers who spread out. In all these cases, a queen or king is worth the extra cost and space.

Types of Full Bed Mattresses

Full/double mattresses come in the same four core construction types as every other size. The type you choose affects comfort, durability, temperature regulation, and price.

Innerspring

Innerspring mattresses use steel coils as the primary support system. Traditional Bonnell coils are connected in a wire framework. Pocketed coils (also called individually wrapped coils) each sit in their own fabric sleeve and compress independently. Pocketed coils are superior for motion isolation because movement on one side does not ripple across the bed.

A full innerspring mattress typically contains between 400 and 1,000 coils depending on the design. More coils generally means better support distribution and less sagging over time. The coil gauge (wire thickness) also matters. Lower gauge numbers mean thicker, firmer wire. A 13-gauge coil is firmer than a 15-gauge coil.

Innerspring mattresses sleep cooler than foam because air circulates freely between the coils. They also tend to have stronger edge support, which means you can sit on the edge of the bed without sliding off. The main downside is motion transfer with Bonnell coils and a shorter comfort lifespan if the pillow top compresses unevenly.

Memory Foam

Memory foam mattresses use layers of viscoelastic polyurethane foam that contour to your body shape under heat and pressure. When you move, the foam slowly returns to its original shape. This body-hugging quality is excellent for pressure point relief, particularly on hips and shoulders for side sleepers.

Full memory foam mattresses typically have 8 to 12 inches of foam in multiple layers. A firmer base layer provides structural support. Transition layers add progressive comfort. The top memory foam layer does the contouring work. Density is measured in pounds per cubic foot (PCF). Higher density foam (4-5 PCF) lasts longer and contours more precisely but also retains more heat.

Heat retention is the primary complaint with memory foam. Newer models address this with gel infusions, copper infusions, open-cell foam structures, and graphite layers that pull heat away from the body. If you sleep hot, ask specifically about cooling features before buying a memory foam full mattress.

Hybrid

Hybrid mattresses combine a pocketed coil base with foam comfort layers on top. The coils handle support, airflow, and edge stability. The foam layers handle pressure relief and body contouring. This combination attempts to give you the benefits of both innerspring and foam without the drawbacks of either.

A typical hybrid full mattress has 6 to 8 inches of pocketed coils topped with 2 to 4 inches of memory foam, latex, or polyfoam. Some hybrids add a micro-coil comfort layer between the base coils and the foam for additional responsiveness. Hybrids are generally 10 to 14 inches thick, making them the thickest standard option.

Hybrids tend to cost more than pure innerspring or pure foam options because they combine expensive materials. But they also tend to satisfy the widest range of sleepers. If you are unsure what type you want, a hybrid is often a safe starting point.

Latex

Latex mattresses use natural rubber (Dunlop or Talalay process) or synthetic latex as the primary comfort and support material. Natural latex is harvested from rubber trees and is one of the most durable mattress materials available, often lasting 15 to 20 years. Talalay latex is lighter and more consistent in feel. Dunlop latex is denser and firmer.

Latex responds to pressure instantly, unlike memory foam which compresses slowly. This makes latex mattresses feel more "bouncy" and responsive. You sleep on top of a latex mattress rather than sinking into it. Latex is also naturally hypoallergenic, antimicrobial, and resistant to dust mites.

Natural latex mattresses are the most expensive option in a full/double size, typically starting around $1,200 and going up to $3,000 or more. Synthetic latex blends are more affordable but do not last as long. If you have a latex allergy, avoid natural latex entirely. Synthetic latex (styrene-butadiene rubber) does not trigger latex allergies.

Full Mattress Types Compared

Firmness Options and How to Choose

Mattress firmness is rated on a scale of 1 to 10, with 1 being the softest and 10 the firmest. Most mattresses sold in Canada fall between 4 and 8. There is no universal firmness standard, so a "medium" from one manufacturer may feel like a "medium-firm" from another. This is why testing a mattress in person matters.

Soft (3-4): Deep sinking and maximum pressure relief. Best for side sleepers under 130 pounds. Can cause spinal misalignment for heavier sleepers or back sleepers who need lumbar support.

Medium (5): Balanced conforming and support. Works for most side sleepers and some back sleepers in the 130-200 pound range. The most commonly sold firmness level in Canada.

Medium-Firm (6-7): The firmness Brad recommends most often at Mattress Miracle. It provides enough give for shoulder and hip comfort without letting the midsection sag. Works well for back sleepers, combination sleepers, and most body types between 130 and 250 pounds.

Firm (8-9): Minimal sinking with strong pushback. Best for stomach sleepers who need to keep their spine neutral and heavier sleepers over 250 pounds who would sink too deeply into a softer mattress. Also recommended for people with lower back pain who need consistent lumbar support.

Price Ranges in Canada

Full/double mattress prices in Canada vary widely based on construction, materials, brand, and where you buy. Here is what to expect in 2026:

Sales tax in Ontario adds 13% HST to the sticker price. A $999 mattress becomes $1,128.87 after tax. Factor this into your budget. Some retailers include delivery in the price; others charge $50 to $150 extra. Mattress Miracle includes white glove delivery across Southern Ontario for qualifying purchases.

The full/double size typically costs 10-15% less than the same mattress in queen. If budget is a concern and you are a single sleeper, the full/double offers the same construction quality at a lower price point. You are paying for less material, not a lesser product.

Online and Big Box vs Local Mattress Stores

Searching for a "costco double bed mattress" or "double bed mattress costco" is a common starting point. Costco carries full/double mattresses from brands like Sealy, Beautyrest, and their Kirkland house brand, typically priced between $400 and $1,200 CAD. The appeal is obvious: Costco's generous return policy, competitive pricing, and the convenience of adding a mattress to your regular shopping trip.

But there are important differences between buying a mattress at a warehouse store versus a dedicated mattress retailer.

Brad has seen a pattern over nearly 40 years in the mattress business: people buy a mattress at a big box store because the price is good, then come to Mattress Miracle two years later because the mattress was not right for their body and nobody was there to guide them. A mattress you keep for 10 years at $1,200 costs you $0.33 per night. A mattress you replace after 2 years at $600 costs $0.82 per night and the hassle of shopping again.

Online mattress-in-a-box brands are another option. Companies like Endy, Douglas, and Casper ship compressed mattresses directly to your door. Prices for full/double models range from $700 to $1,500 CAD. The advantage is a risk-free trial period (typically 100-120 nights). The disadvantage is that you cannot try the mattress before buying, and returning a mattress is a significant inconvenience even when it is free.

Air Mattress as a Temporary Double Bed Solution

If you are searching for an "air mattress double bed," you are likely looking for a temporary sleeping solution. Air mattresses are useful for overnight guests, camping trips, temporary housing, or as a stopgap while you shop for a permanent mattress. They are not a replacement for a real mattress for nightly use.

A double/full air mattress matches the same 54" x 75" footprint as a standard full mattress. Prices range from $40 for a basic vinyl model to $250 for a raised air mattress with a built-in pump, flocked top, and internal coil structure.

What works: Air mattresses are portable, affordable, and easy to store. A good one can provide a comfortable night's sleep for a guest. Raised models (18-22 inches high) are easier to get in and out of and feel more like a real bed.

What does not work: Air mattresses lose pressure overnight. You will wake up partially deflated on most models, especially cheaper ones. They provide no spinal support for long-term use. They sleep hot because vinyl and PVC do not breathe. They puncture easily around pets and sharp objects. And they are noisy when you move.

If you need a full-size sleeping surface for regular use but cannot afford a premium mattress right now, a budget innerspring full mattress at $299 to $499 will serve you far better than even the best air mattress. Your spine will thank you.

What to Look for in a Full Bed Mattress

Not all full mattresses are created equal. Here are the features that separate a good mattress from one you will regret in six months.

Edge Support

Edge support refers to how well the mattress maintains its structure when you sit or sleep near the perimeter. On a full/double mattress, edge support matters more than on a queen or king because you have less surface area. Weak edges effectively shrink your usable sleep surface by 4 to 6 inches on each side.

Mattresses with reinforced perimeter coils, high-density foam encasement, or steel edge rods provide the best edge support. Innerspring and hybrid mattresses generally outperform all-foam models for edge support. When testing a mattress in the store, sit on the edge and notice whether you feel like you are sliding off. If you do, move on.

Motion Isolation

Motion isolation is how well the mattress absorbs movement without transferring it across the surface. This matters most if you share the bed, but even single sleepers benefit from good motion isolation because it prevents your own tossing and turning from waking you up.

Memory foam provides the best motion isolation. Pocketed coils are second best because each coil compresses independently. Bonnell coils and continuous wire coils provide the worst motion isolation because the entire spring system is interconnected.

Cooling

If you sleep hot, cooling technology is not optional. Look for mattresses with gel-infused memory foam, open-cell foam structures, phase-change material covers, copper or graphite infusions, or coil systems that allow airflow. Innerspring mattresses naturally sleep cooler than all-foam models. Latex is naturally temperature neutral. Memory foam without cooling technology is the warmest option.

Breathable mattress covers also make a significant difference. Look for covers made with Tencel, bamboo-derived rayon, or moisture-wicking fabrics rather than thick quilted polyester tops that trap heat.

Durability and Warranty

A full mattress should last 7 to 10 years minimum. Look for warranties of at least 10 years. Read the warranty terms carefully. Many warranties only cover manufacturing defects and sagging beyond 1.5 inches, not general comfort complaints or normal wear. Some warranties are prorated, meaning you pay an increasing percentage of the replacement cost over time.

Foam density is the best predictor of durability in foam mattresses. Base layers should be at least 1.8 PCF density. Comfort layers should be at least 3.5 PCF for memory foam. Below these thresholds, foam breaks down faster and develops body impressions.

CertiPUR-US Certification

If the mattress contains polyurethane foam or memory foam, look for CertiPUR-US certification. This means the foam has been independently tested for harmful chemicals, heavy metals, formaldehyde, phthalates, and off-gassing emissions. Most reputable Canadian mattress brands use CertiPUR-US certified foams, but verify before buying, especially with budget imports.

Restonic ComfortCare Double: A Closer Look

At Mattress Miracle, one of our most popular full/double mattresses is the Restonic ComfortCare series. Here is why Brad recommends it.

The Restonic ComfortCare in double/full size features 980 individually wrapped pocketed coils. That is a high coil count for a full-size mattress, meaning each coil is smaller and more responsive to your body's contours. More coils equals better support distribution and better motion isolation.

The AlumiLast gel memory foam in the comfort layer addresses the heat retention issue that plagues standard memory foam. The gel infusion pulls heat away from your body and distributes it across the foam surface. Combined with the airflow through 980 pocketed coils, this mattress sleeps noticeably cooler than a standard memory foam full mattress.

The TempaGel foam perimeter means you can use the full 54-inch width of the mattress without feeling like you are going to roll off the edge. On a full-size mattress where every inch of sleeping surface counts, this edge support is a meaningful upgrade over basic foam encasement.

If you are considering a box spring mattress setup, the ComfortCare works well with both traditional box springs and modern platform bases. Brad can recommend the right foundation based on your bed frame.

Bedding and Accessories for a Full/Double Bed

Once you have your full mattress, you need the right bedding to go with it. Here is what to look for.

Sheets

Full/double sheets fit a mattress that is 54" x 75". This is a standard size and easy to find in Canada. Look for deep-pocket fitted sheets if your mattress is 12 inches or taller. Standard fitted sheets are designed for mattresses up to 10-11 inches deep. A fitted sheet that is too shallow will pop off the corners during the night.

For material, long-staple cotton (Egyptian or Supima) in a sateen or percale weave offers the best combination of durability and comfort. Thread counts between 300 and 600 are the sweet spot. Above 600, manufacturers often use multi-ply threads to inflate the number without improving quality.

Mattress Protector

A waterproof mattress protector is not optional. It protects your mattress from sweat, spills, dust mites, and allergens. Without one, your mattress warranty may be voided if a stain causes damage. Look for a protector with a polyurethane membrane (not vinyl, which is noisy and hot) and a cotton or Tencel top surface for breathability.

Pillows

On a full/double bed, two standard pillows (20" x 26") sit side by side with about 2 inches to spare. If you prefer a more finished look, two full/queen pillows (20" x 30") fill the width exactly. Choose pillow loft based on your sleep position: low loft for stomach sleepers, medium for back, and high loft for side sleepers.

Mattress Topper

If your full mattress is slightly too firm but otherwise in good shape, a 2 to 3 inch memory foam or latex topper can adjust the comfort level without replacing the entire mattress. Toppers range from $80 to $300 CAD for a full size. They are especially useful for extending the life of a mattress that has developed minor body impressions.

Room Size Requirements

A full/double mattress needs a minimum room size of 10 x 10 feet (100 square feet) to function comfortably. This allows for the bed, 24 inches of walking space on each side, and room for basic furniture.

Here is how different room sizes work with a full/double:

Measure your room before you shop. A surprising number of people buy a mattress and then discover it overwhelms the room or leaves no space for the bedroom door to open fully. Leave at least 24 inches of clearance on any side you need to walk past and 36 inches in front of any dresser with drawers.

If your room is 12 x 12 or larger, consider whether a queen might be the better choice. The extra 6 inches of width and 5 inches of length make a significant difference in sleeping comfort, and you would still have plenty of room for furniture. A full/double is the right mattress for rooms where a queen would be too tight, not for rooms where a queen would fit easily.

Frequently Asked Questions