Serta Perfect Day 12 inch Firm Mattress in a Box on a blue bed frame in a modern bedroom. Perspective view of the Serta Perfect Day 12 inch firm mattress with a quilted breathable top. Top view of the textured, diamond-quilted white surface on a Serta Perfect Day firm mattress. Close-up of the Serta Perfect Day mattress border and logo, highlighting the durable firm construction. Serta Perfect Day internal view showing individually wrapped pocketed coils for firm, targeted support. Serta Perfect Day 12 inch firm mattress styled in a clean, contemporary bedroom for better sleep. Person sleeping on their side to show proper alignment on the Serta Perfect Day 12 inch firm mattress. Macro shot of the breathable, soft-to-the-touch fabric on a Serta Perfect Day firm mattress. Serta Perfect Day layer diagram showing pillow top comfort, 3-zone support, and cooling gel technology.
Serta Perfect Day 12" Firm Mattress in a Box
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Serta Perfect Day 12" Firm Mattress in a Box

$549.00
$849.00
Save $300.00
Brand: Serta
Size
i Size Guide
$549.00
Only 15 left in stock
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10-Year Limited Warranty, 10-Year Limited Warranty,

To begin with, the Serta Perfect Day 12 Inch Firm Mattress ships as a compact roll, giving you the mattress-in-a-box for back sleepers' convenience that glides through tight halls and doorways. 

Next, a breathable quilt finished with QuiltLoft™ Memory Foam provides a touch of softness before the firm hybrid mattress with gel foam core takes over. A 3-Zone gel-foam band reinforces the lumbar region, supplying targeted spinal alignment support that many shoppers call the Best 12-inch firm mattress for back pain. 

Deeper down, individually wrapped coil support responds to your shape and isolates motion, so couples rest undisturbed. Meanwhile, an antimicrobial, breathable design helps the surface stay fresh and cool through every season. Because of this balanced build, the bed suits back, stomach, and combination sleepers who crave a steady feel without sag. 

Finally, you can buy a Serta 12-inch firm mattress online today with free shipping in the USA, flexible financing, and a $250 sale savings—making the upgrade from a guest-room twin to a Serta 12-inch firm mattress king remarkably simple.

Firm Support with Added Comfort Layers

QuiltLoft™ Memory Foam softens first contact while keeping the overall feel stable.

3-Zone Gel-Foam Lumbar Band

Extra reinforcement under the hips encourages healthier posture and fewer morning aches.

Individually Wrapped Coil Core

Pocketed springs cut partner motion and add bounce for undisturbed sleep for couples.

Antimicrobial & Breathable Design

Built-in freshness layer and airflow foams keep the mattress cooler and cleaner.

Effortless Setup

Boxed delivery unrolls in minutes and reaches full feel within a day.

Limited-Time Sale + Financing

Save $250 now and split payments over time if desired.

Key Mattress Benefits

Serta Perfect Day 12" Firm Mattress in a Box

5 Layers
Of Cooling
Comfort

Soft knit fabric and memory-foam quilting ease pressure while maintaining a firm overall feel.

Targeted strip under the lumbar zone reinforces support and promotes alignment.

High-density layers spread weight evenly and resist lasting body impressions.

Hundreds of responsive coils conform independently, block partner motion, and boost edge stability.

Ventilated materials and a freshness layer help the mattress stay cool and odor-free.

Serta Perfect Day 12" Firm Mattress in a Box
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FASTEST SHIPPING

Get your new mattress delivered quicker than ever with our priority nationwide shipping. No long waits, comfort arrives right at your door step, fast.

CUSTOMER SUPPORT

24 / 7 CUSTOMER SUPPORT

Whether its day or night, our dedicated team is always available to answer questions, resolve issues, and guide you through every step.

GUIDANCE

EXPERT GUIDANCE

Not sure which mattress suits you best? our sleep experts are here to help you choose the perfect option tailored to your comfort, health and lifestyle needs.

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WE'VE GOT ANSWERS
HAVE QUESTIONS?

WE'VE GOT ANSWERS

Designed for deep comfort and better rest, so you wake up refreshed and ready for the day

It is a firm hybrid mattress with gel foam comfort layers over individually wrapped coils.

The page lists it as Firm Comfort, making it suitable for back, stomach, and many combination sleepers.

Yes. It rolls, seals in plastic, and ships inside a manageable carton for easy in-home setup.

Its 3-Zone gel-foam band and firm coils keep the spine level, which can lessen back strain for many sleepers. Results vary, so use the 120-day trial to confirm relief.

Most sleepers can lie on it after four hours, but allow up to 24 hours for full height and feel to develop.

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