Twin Xl Anti Sag Mattresses

Twin Xl Anti Sag Mattresses offer a practical size for bedrooms, guest spaces and growing sleepers. Explore options at Mattress Firm to compare mattresses based on your preferred feel, materials and budget, then find the right fit for your sleep space.

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Sleepy's By Sealy Medium Euro Top Mattress

4477

Starting at

$210⁰⁰

$419⁹⁹

$210 OFF

Medium Comfort, best for

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

Beautyrest PressureSmart 2.0 Firm 11" Mattress

Starting at

$675⁰⁰

$1349⁹⁹

$675 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Plush 11.75" Mattress

6252

Starting at

$725⁰⁰

$1449⁹⁹

$725 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Plush Mattress

2794

Starting at

$529⁹⁹

$829⁹⁹

$300 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tempur-Pedic TEMPUR-Adapt 11" Medium Previous Generation Mattress

3645

Starting at

$1189⁷⁷

$1699⁰⁰

$509 OFF

Medium Comfort, best for

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

Beautyrest BR800 13.5" Plush Pillow Top Mattress

2792

Starting at

$549⁹⁹

$1179⁹⁹

$630 OFF

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3302

Starting at

$569⁹⁹

$1359⁹⁹

$790 OFF

Extra Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 11.25" Firm Mattress

2239

Starting at

$469⁹⁹

$959⁹⁹

$490 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Sleep Excellence Plush Mattress

733

Starting at

$549⁷⁷

$1099⁹⁹

$550 OFF

Plush Comfort, best for

Side Sleepers
Pain
Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tulo Bamboo 12" Medium Plush Green Tea Memory Foam Mattress

5567

Starting at

$279⁹⁹

$659⁹⁹

$380 OFF

Medium Comfort, best for

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

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1868

Starting at

$549⁹⁹

$1179⁹⁹

$630 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1816

Starting at

$669⁹⁹

$1559⁹⁹

$890 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1749

Starting at

$669⁹⁹

$799⁹⁹

$130 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Purple Original Mattress

59751

Starting at

$1040⁰⁰

$1299⁰⁰

$259 OFF

Medium Comfort, best for

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

Sealy Essentials Winter Green 13" Plush Euro Pillow Top Mattress

549

Starting at

$614⁹⁹

$1129⁹⁹

$515 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Beautyrest BR800 12" Plush Euro Top Mattress

739

Starting at

$429⁹⁹

$1099⁹⁹

$670 OFF

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

Sealy Essentials Winter Green 12" Medium Euro Top Mattress

604

Starting at

$489⁹⁹

$879⁹⁹

$390 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1192

Starting at

$579⁰⁰

$649⁰⁰

$70 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 12" Plush Mattress

1147

Starting at

$529⁹⁹

$1399⁹⁹

$870 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Nurture Night 14.5" Pillow Top Mattress

1136

Starting at

$679⁰⁰

$849⁰⁰

$170 OFF

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Premier 13" Medium Memory Foam Mattress

499

Starting at

$749⁰⁰

$1199⁰⁰

$450 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Nurture Night 13.5" Medium Mattress

1025

Starting at

$659⁰⁰

$749⁰⁰

$90 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Oasis Sleep 14.5" Pillow Top Mattress

1013

Starting at

$789⁰⁰

$949⁰⁰

$160 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Oasis Sleep 12" Extra Firm Mattress

910

Starting at

$769⁰⁰

$949⁰⁰

$180 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's 4" Reversible Gel Memory Foam Topper

Starting at

$139⁹⁹

$199⁹⁹

$60 OFF

Medium Comfort,

Temperature
Allergies

Serta Perfect Sleeper Nurture Night 13.5" Plush Mattress

921

Starting at

$659⁰⁰

$749⁰⁰

$90 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

A Twin XL anti-sag mattress is designed to provide consistent support and help maintain a comfortable, even sleep surface over time. Measuring approximately 38 inches wide by 80 inches long, a Twin XL mattress offers extra length for taller sleepers, college students and guest rooms with limited space. Look for a supportive mattress featuring durable high-density foam, individually wrapped coils or a hybrid combination of both. Reinforced edge support can help reduce sagging along the perimeter, while responsive comfort layers cushion pressure points without allowing the body to sink too deeply. Choosing the right firmness for your sleep position, body type and comfort preferences can also promote better spinal alignment and help prevent uneven wear. To get the most from a Twin XL mattress, pair it with a sturdy, properly sized foundation or adjustable base that provides consistent support across the entire sleep surface. Check the manufacturer’s requirements for slat spacing and center support before setup, since an inadequate bed frame can contribute to premature dipping or sagging. Rotating the mattress as recommended may help distribute wear, although many modern mattresses do not need to be flipped. At Mattress Firm, you can explore Twin XL mattresses in a range of firmness levels and designs, including memory foam, innerspring and hybrid options, to find comfortable, long-lasting support for better zzz's.

What is an anti-sag mattress? + -

An anti-sag mattress is designed with materials and internal construction intended to help maintain a more even sleep surface over time. Common features may include reinforced edges, durable comfort layers and supportive coil systems.

What materials are commonly used in anti-sag mattresses? + -

Common materials include individually wrapped coils, high-density foams, latex and reinforced edge support. The exact combination varies by mattress, so review the product details to understand its construction.

What firmness options are available in anti-sag mattresses? + -

Anti-sag mattresses are available in a range of firmness levels, from plush to firm. Choose based on your preferred feel and the type of comfort and support you want from your sleep surface.

How should I care for an anti-sag mattress? + -

Use the recommended foundation, rotate the mattress if the manufacturer advises it and protect the surface with a breathable mattress protector. Always follow the care instructions provided with your mattress.

Can an anti-sag mattress be used with an adjustable base? + -

Some anti-sag mattresses are compatible with adjustable bases, while others are intended for a stationary foundation. Check the product specifications before pairing your mattress with an adjustable base.