Serta Perfect Sleeper X Quilted Hybrid Knox Plush 13.75 Inch Mattress on a modern wood platform bed.
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.
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.
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.
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.
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.
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 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 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

Brand Serta

$899.00
$1,499.00
Save $600.00
Snap Logo Lease for as low as $/week Learn More

Best For

Side Sleepers

Firmness

Plush Comfort
Only 22 left in stock
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Only 22 left in stock

Free Delivery to your  House in 1-2 Weeks.

Free USA Wide Delivery

We offer free delivery on orders over $100. Ships within 1–2 weeks 

Mattress Size

✅ Twin: Provides a comfortable sleep space for one child or adult.

✅ Dimensions: 38" wide x 74.5" long.

 

✅ Full: Children, Single Adults, Adults with Children and/or Pets.

✅ Dimensions: 53" wide x 74.5" long.

 

✅ Queen: The most popular size, providing ample space for two adults to sleep comfortably.

✅ Dimensions: 60" wide x 79.5" long.

 

✅ King: Experience generous space without crowding your partner.

✅ Dimensions: 76" wide x 79.5" long.

 

✅ California King: Perfect for taller individuals, ensuring a comfortable sleep.

✅ Dimensions: 72" wide x 83.5" long.

Product Overview

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.

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key mattress benefits
Plush Zoned Comfort for Pressure Relief

Soft, cushioned feel with 5-zone support system that adapts to your body—ideal for side sleepers and pressure point relief.
Advanced Hybrid Support System

Combines responsive coils with Perfect Conform™ Graphite Memory Foam for balanced support and contouring comfort.
Cooling Technology for Comfortable Sleep

Graphite-infused memory foam and CushionGel™ Foam help dissipate heat and maintain a cooler sleep surface.
Motion Isolation for Undisturbed Sleep

Designed to reduce motion transfer, making it perfect for couples and light sleepers.

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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

$899.00