Sofa Mattress Full Size

Shop Sofa Mattress Full Size options at Mattress Firm to find a mattress that fits your space, sleep preferences and budget. Explore available choices for sofa beds, guest rooms and everyday use, then compare options to make shopping for your next mattress easy.

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Sleepy's Basic Memory Foam Firm Mattress

3239

Starting at

$239⁷⁷

$799⁹⁹

$560 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn
Support

Beautyrest PressureSmart 2.0 Plush 11.75" Mattress

6252

Starting at

$775⁰⁰

$1549⁹⁹

$775 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Rest Medium Innerspring Mattress

7012

Starting at

$261⁰⁰

$949⁹⁹

$689 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1873

Starting at

$1179⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Purple Original Mattress

59759

Starting at

$1200⁰⁰

$1499⁰⁰

$299 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Temperature
Pain
Bed Partner
Toss and Turn
Allergies

Sleepy's By Sealy Medium Euro Top Mattress

4503

Starting at

$225⁰⁰

$449⁹⁹

$225 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2621

Starting at

$1099⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 11.25" Firm Mattress

2242

Starting at

$959⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1753

Starting at

$849⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Allergies
Bed Partner
Temperature
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 13" Plush Euro Pillow Top Mattress

549

Starting at

$1169⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Beautyrest BR800 12" Plush Euro Top Mattress

745

Starting at

$1099⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tulo Lavender 6" Firm Memory Foam Mattress

217

Starting at

$182⁹⁹

$319⁹⁹

$137 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Bed Partner
Allergies
Toss and Turn

Sealy Essentials Winter Green 12" Medium Euro Top Mattress

604

Starting at

$1039⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn
Allergies

Beautyrest Silver BRS900 12" Plush Mattress

1149

Starting at

$1399⁹⁹

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

233

Starting at

$599⁰⁰

$949⁰⁰

$350 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Tempur-Pedic TEMPUR-Cloud Mattress Topper

671

Starting at

$154⁰⁰

Medium Comfort,

Temperature
Allergies

Sealy Essentials Winter Green 12" Plush Euro Top Mattress

393

Starting at

$1039⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Beautyrest Black Series Three 15.25" Medium Mattress

2307

Starting at

$3129⁰⁰

$3729⁰⁰

$600 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple Plus Mattress

2012

Starting at

$1600⁰⁰

$1999⁰⁰

$399 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Purple Restore 11.5" Soft Hybrid Mattress

1666

Starting at

$1980⁰⁰

$2499⁰⁰

$519 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Beautyrest Black Series Three 16.75" Plush Pillow Top Mattress

1471

Starting at

$3529⁰⁰

$4129⁰⁰

$600 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 16.25" Medium Pillow Top Mattress

471

Starting at

$3529⁰⁰

$4129⁰⁰

$600 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Serta Perfect Sleeper Pacific Peace 12" Hybrid Firm Mattress

242

Starting at

$979⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Studio 14.5" Medium Euro Pillow Top Mattress

149

Starting at

$1749⁰⁰

$2049⁰⁰

$300 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Kodiak Suede 7" Futon Mattress & Frame

Starting at

$867⁹⁹

Medium Comfort,

Kodiak Linen 7" Futon Mattress & Frame

Starting at

$900⁹⁹

Medium Comfort,

A full-size sofa mattress is designed to refresh the sleeping surface inside a pull-out sofa, giving overnight guests a more comfortable place to rest without replacing the entire piece of furniture. Although these mattresses are often described as full size, they are usually more compact than a standard full mattress so they can fold into the sofa frame. A typical full-size sofa mattress measures about 52 to 54 inches wide by 72 inches long, while the thickness is commonly around 4 to 4.5 inches. Dimensions can vary slightly between manufacturers and sofa models, so measuring before making a purchase is an important first step. Open the sleeper sofa, remove the existing mattress if possible and measure the length, width and available height inside the frame. Also check the folded mattress space and the sofa’s support system. A mattress that is too thick may prevent the mechanism from closing properly, while one that is too wide or long may bunch, bow or place unnecessary strain on the frame. The goal is a close fit that lies flat when opened and folds neatly when the sofa returns to seating position. A full-size sofa mattress can be a practical choice for a guest room, apartment, family room or home office that needs to serve more than one purpose. It gives visiting friends and relatives a dedicated sleeping surface without taking up the space of a permanent bed, and it can make a familiar sofa feel more welcoming during sleepovers, family visits and extended stays. For a smaller home, it can help turn one room into a comfortable living area by day and a guest room by night. Some shoppers also choose this mattress size as part of a thoughtful housewarming or home refresh gift, particularly for someone who regularly hosts guests but does not have room for a traditional bed.

Comfort depends on more than the size printed on the package. The materials inside a full-size sofa mattress influence how it feels, how it responds to movement and how well it holds up to repeated folding. Gel memory foam can contour around the body and cushion pressure points, with gel components often included to help manage heat for sleepers who prefer a cooler feel. Denser memory foam can provide a steadier, more supported sensation and may be a useful option when the sofa bed is used regularly rather than only for occasional visitors. Polyfoam can offer a lighter, responsive feel and may be easier to handle when changing or storing the mattress. Traditional innerspring designs allow airflow and provide familiar bounce, though the feel can vary depending on the coil construction and the padding above it. Latex options are known for a resilient surface that responds quickly instead of allowing the sleeper to sink deeply, and they may appeal to shoppers looking for durable, naturally derived materials. No single construction is right for every sleeper. A side sleeper may appreciate cushioning around the shoulders and hips, while a back or stomach sleeper may prefer a more supportive surface that helps prevent excessive sinking. Couples should consider motion transfer, edge support and the sofa frame beneath the mattress, since a mattress can only do so much if the support deck has pronounced gaps or uneven bars. If the sleeper sofa is used mainly during the cooler months, a comfortable cover and breathable bedding can create a warm, inviting setup. As the weather warms, lightweight sheets and a washable mattress protector can help the sleeping surface feel fresher. For another flexible option in a compact guest space, explore Floor Mattress Full Size products that can be arranged for guests and stored when the room is needed for another purpose.

Before purchasing a full-size sofa mattress, compare the measurements with the sofa manufacturer’s specifications and confirm the mattress is intended for a pull-out frame. A standard eight-inch bed mattress is generally too thick for this application and may interfere with the folding mechanism, so a sofa-specific profile is essential. Look for clear information about the unfolded dimensions, thickness, materials and recommended use. If the sofa is used every night, prioritize construction and support that can withstand frequent folding, unfolding and sleeping. If it is reserved for occasional guests, comfort, easy handling and convenient storage may be more important. Weight can also matter: a lighter mattress is easier to remove when cleaning the sofa compartment, while a denser design may feel more substantial under the body. A fitted sheet made for the sofa mattress size can reduce shifting, and a breathable protector helps defend against spills, dust and everyday wear without changing the fit too dramatically. Let the mattress air out according to the care instructions before adding bedding, especially after it has been compressed for shipping or storage. Keep the folding frame clear of blankets, pillows and loose fabric, and avoid forcing the sofa closed if the mattress does not settle into place. Rotating the mattress from head to foot when the design allows can help distribute wear, although it should not be folded in a direction the manufacturer does not recommend. With the right measurements, a suitable profile and materials matched to the way the sofa is used, a full-size sofa mattress can turn an occasional sleeping arrangement into a more restful part of the home. It is a simple way to make guests feel considered, create a better night’s sleep in a multipurpose room and make the most of the furniture already in your space. We make sleep easy™ with options that help you find a comfortable fit for everyday living and overnight hosting.

What is a sofa mattress? + -

A sofa mattress is designed to fit inside a sofa bed frame, allowing the furniture to function as both seating and a sleeping surface. It is typically made with flexible materials that support repeated folding and unfolding.

What materials are used in sofa mattresses? + -

Sofa mattresses may be made with innerspring coils, memory foam, polyfoam or a combination of materials. Each construction offers a different feel, level of cushioning and overall design.

How do I choose a sofa mattress feel? + -

Consider whether you prefer a cushioning, contouring or more responsive feel. Reviewing the mattress materials and construction can help you find an option that complements your comfort preferences.

How should I care for a sofa mattress? + -

Follow the care instructions provided with your mattress. Keep the mattress dry, use compatible bedding and regularly inspect the sofa bed mechanism to help maintain a clean, comfortable sleep space.

Can I replace the mattress in my sofa bed? + -

Many sofa beds can accommodate a replacement mattress. Before choosing one, check the sofa bed frame specifications and measure the available mattress compartment to help ensure a proper fit.