Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress on a modern wood platform bed. Serta Knox Plush 13.75 Inch Quilted Hybrid Mattress with decorative patterned top and side handles. Front view of Serta Perfect Sleeper X Knox Plush mattress showcasing cooling and support technology labels. Decorative black and white floral patterned quilted top of the Serta Perfect Sleeper X Knox Plush mattress. Side profile of the 13.75 inch Serta Knox Plush Quilted Hybrid mattress highlighting its thick comfort layers. Close-up of the Serta Perfect Sleeper X Hybrid Knox Plush mattress branding and durable quilted border. Serta Knox Plush mattress comfort scale showing plush support ideal for side sleepers. Serta mattress diagram showing plush zoned comfort, advanced hybrid support, and cooling technology layers.
Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress
Ultra Soft Soft Medium Soft Medium Medium Firm Firm Extra Firm

Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress

$1,099.00
$1,499.00
Save $400.00
Brand: Serta
Size
Best for Side sleepers
i Size Guide
$1,099.00
Only 22 left in stock
Free Shipping · Ships Within 1–3 Weeks Free Shipping · Ships Within 1–3 Weeks
10-Year Limited Warranty 10-Year Limited Warranty
100-Night Trial 100-Night Trial

To begin with, the Serta Perfect Sleeper X Quilted Hybrid Knox Plush greets you with cloud-like soft comfort layers finished in CoolFeel® Plus fabric that feels cool at first touch. Next, EverCool® Supreme gel memory-foam and additional pressure-relieving soft foam layers cradle shoulders and hips, turning this bed into the best 14 inch plush mattress for side sleepers who need gentle contouring. 

Beneath the foams, a five-zone gel-foam lumbar band and individually wrapped coil hybrid core promote targeted spinal alignment support, steadying back sleepers as well. Because each of the 920 Q4™ springs moves alone, the mattress delivers advanced motion isolation for couples. Excel-inspired edge reinforcement stops roll-off, and the 13.75-inch profile gives a luxury, high-rise look. 

Finally, Cloudy Mattress lets you Buy Serta Knox Plush mattress online with free shipping USA, fast 1–2 week delivery, and easy financing, so claiming a soft hybrid mattress with pocketed coils is effortless while the Serta Perfect Sleeper X sale lasts.

Plush Quilted Hybrid Feel

CoolFeel® Plus quilt and plush foams relax muscles without deep sag.

Five-Zone Lumbar Band

Extra lift beneath hips keeps the spine level and helps relieve hip pain.

EverCool® Supreme Gel Foam

Gel infusion wicks heat, sustaining a cool-to-the-touch sleep surface.

Individual Coil Motion Control

920 pocketed springs absorb movement for consistently quiet nights.

Excel Edge-Inspired Perimeter

Reinforced edge expands usable sleep space and prevents sag.

Sale + Flexible Payments

Current $600 discount plus Affirm financing make upgrades easy.

Key Mattress Benefits

Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress

6 Layers
Of Cooling
Comfort

Smooth knit with cooling fibers delivers an immediate refreshing sensation.

High-density gel foam contours closely and relieves pressure without trapping heat.

The targeted layer under the torso supports alignment and enhances durability.

Softer layers distribute weight gently for long-lasting plushness.

Pocketed springs adapt independently, limit partner motion, and reinforce the perimeter.

Firm bottom foam anchors the coil unit for extended life.

Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress
CLOUDY MATTRESS IS THE SMARTER CHOICE
DISCOVER WHY BUYING WITH

CLOUDY MATTRESS IS THE SMARTER CHOICE

From better sleep support to trusted quality, Cloudy Mattress gives you more value for your money.

SHIPPING

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.

GUARANTEED

BEST PRICE GUARANTEED

Shop with confidence knowing you're getting the best value. If you find a better deal, we'll matach it, guaranteed.

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

Yes. Plush foams relieve shoulder and hip pressure, and zoned support keeps alignment, which side sleepers appreciate.

No. Any solid platform, slatted base with gaps under three inches, bunkie board, or adjustable frame offers proper support; a box spring is optional.

Both share the same hybrid construction. Plush uses softer comfort foams for a gentle, cloud-like feel, while Firm swaps denser layers for extra lift suited to back and stomach sleepers.

CoolFeel® Plus fabric and EverCool® gel memory foam move heat away, keeping the surface cooler through the night.

Choose fitted sheets with a pocket depth of at least 15–16 inches to ensure corners remain secure on a 13.75-inch profile.

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