Simmons Beautyrest World Class 14.5" Medium Firm Mattress in a luxury modern bedroom setting.

Simmons Beautyrest World Class Level 3 14.5 Inch Medium Firm Mattress with a quilted comfort top.

Detailed view of Beautyrest World Class medium-firm mattress texture for pressure-relieving support.

Simmons Beautyrest World Class 14.5" Mattress and matching foundation set for complete sleep support.

Beautyrest mattress diagram showing targeted pressure relief and enhanced lumbar support for better rest.

Simmons Beautyrest World Class Level Three Medium Firm 14.5 Inch Mattress

Plush Medium Firm Pillow top Memory foam Hybrid

Simmons Beautyrest World Class Level Three Medium Firm 14.5 Inch Mattress

$1,399.00

$1,699.00

Save $300.00

Brand:

beautyrest

i Size Guide

$1,399.00

Only 15 left in stock

Free USA Wide Delivery

10 Year Warranty

Advanced Technology

The Beautyrest World Class Level 3 Medium Firm Mattress brings together premium triple-strand coil support, advanced cooling foams, and sustainable luxury fabric in a refined 14.5-inch hybrid build.

Cloudy Mattress is an Authorized Simmons Beautyrest retailer, so every purchase is backed by the full manufacturer's warranty. The feel sits firmly on the medium-firm side of the comfort scale, balancing contouring comfort with the responsive support of a premium hybrid coil system.

Because of this versatile response, it ranks among the best 15-inch medium firm mattresses for back pain options for back, side, and stomach sleepers alike. Inside, multiple engineered components work together, starting with an InfiniCool Lux cooling cover that delivers cool-to-the-touch surface comfort.

This Beautyrest Harmony Lux Diamond Series member uses InfiniCool Lux cooling technology with two layers of active cooling at the surface for hot sleepers. Furthermore, the cover features Seaqual sustainable ocean plastic fabric, transforming recovered ocean plastics into high-quality upcycled fibers for an eco-conscious sleep surface.

Beneath the cooling cover, Micro Diamond memory foam is infused with actual diamond particles engineered to conduct heat away from the body. This premium foam layer pairs with SurfaceTouch Gel Memory Foam for immediate, advanced pressure point relief from the moment you lie down.

The mattress also features Beautyrest's Precision Support System powered by T3 Pocketed Coil technology, the brand's premier triple strand coil support design. This premium coil system delivers Beautyrest's highest level of individualized support, ideal for targeted lumbar support and alignment across all sleep positions. Furthermore, the pocketed construction provides motion separation for undisturbed sleep, making this an excellent choice for couples sharing the bed.

RightTemp Memory Foam with highly conductive carbon fibers adds a consistent, supportive feel and additional cooling beneath the comfort layers. Together, these layers deliver deep pressure relief for joint pain alongside a hotel-quality medium firm feel that holds up over time.

At a substantial 14.5-inch profile, this 14.5-inch luxury hybrid mattress is fully adjustable-base compatible and pairs beautifully with modern foundations. Additionally, the mattress is made in the USA, built with CertiPUR-US certified foam, and backed by a 10-year limited manufacturer warranty.

Balanced Medium-Firm Feel

This 14.5-inch luxury hybrid mattress suits back, side, and stomach sleepers with balanced pressure relief and structured support.

T3 Triple-Strand Pocketed Coils

Beautyrest's premier T3 Pocketed Coil technology uses triple-strand coil support for the brand's highest level of individualized support.

Diamond-Infused Cooling Foam

Micro Diamond memory foam is infused with diamond particles engineered to conduct heat away from the body for cooler rest.

Two-Layer Active Cooling

InfiniCool Lux cooling technology provides two layers of active cooling with a cool-to-the-touch sleep surface for hot sleepers.

Precision Lumbar Support

The Precision Support System delivers extra support at the center of the mattress for targeted lumbar support and alignment.

Sustainable Ocean-Recovered

Fabric Seaqual sustainable ocean plastic fabric transforms recovered plastics into a luxurious cover for sustainable, eco-friendly luxury sleep.

Motion Separation for Couples

Pocketed coils absorb energy to deliver motion separation for undisturbed sleep, so partner movement is far less noticeable.

Key Mattress Benefits

6 Layers
Of Cooling
Comfort

The exterior cover features two layers of active cooling technology with a cool-to-the-touch surface. The Seaqual sustainable fabric is woven from recycled ocean plastics, supporting both a luxury feel and environmental responsibility.

This top comfort layer is located directly within the quilted sleep surface to deliver immediate pressure relief. As a result, sleepers feel advanced pressure point relief the moment they lie down, with cooling gel that helps regulate temperature.

This premium layer is infused with actual diamond particles engineered to conduct heat away from the body. Furthermore, the conductive diamond infusion supports a cooler sleep surface throughout the night.

This layer features ultra-strong, highly conductive carbon fibers for a consistently supportive feel and cool sleep. Furthermore, the construction adds airflow through this critical mid-mattress layer.

The premium T3 ocketed PCoil technology features triple-strand wire construction for Beautyrest's highest level of individualized support. Furthermore, the pocketed design reduces motion transfer between partners for undisturbed rest.

This high-density base foam anchors the entire mattress build and reinforces the no-flip design. It helps maintain consistent shape, performance, and stability for years of dependable use.

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Insomnia — medium firm support eliminated physical restlessness

My sleep therapist identified physical restlessness as a contributing factor to my sleep onset insomnia — I was unconsciously shifting to find comfort on my old uneven mattress. She recommended a new, consistent, properly supportive medium firm mattress to eliminate physical comfort as a barrier to sleep. The Simmons World Class Level Three has a perfectly even surface with consistent medium firm support. My nighttime shifting has reduced dramatically and my onset time with it.

Year one — World Class quality confirmed

Full year review. The Simmons Beautyrest World Class Level Three Medium Firm is in flawless condition at one year. No body impressions, no sagging, the medium firm feel is unchanged. Rotating every 90 days has been all the care required. The Level Three construction is clearly engineered for the long term. This mattress will easily outlast its warranty and I expect to be reporting the same at year two.

Fibromyalgia — medium firm with sufficient comfort layer depth

My pain specialist's prescription was nuanced: medium firm support to prevent misalignment that worsens widespread pain, but with enough comfort layer depth to prevent pressure point activation. The 14.5-inch World Class Level Three has that depth — the comfort layers don't bottom out under my weight and the medium firm coil system does its structural work below. My fibro pain scores on waking have improved by about 3 points since switching.

Outstanding mattress

Outstanding mattress. The whole family agrees it's the best we've had.

14.5-inch profile — visual impact and practical benefit

The 14.5-inch profile makes our bedroom look like a proper luxury suite. But beyond aesthetics the depth is functional — the comfort layers have room to work without bottoming out, the medium firm feel is cushioned at the surface without losing structural support, and at this height getting in and out of bed is easier on my arthritic knee. Everything about the 14.5-inch profile serves a purpose.

HAVE QUESTIONS?

WE'VE GOT ANSWERS

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

Yes, the World Class Level 3 Medium Firm is well-suited for back sleepers. The balanced medium-firm feel combined with premium T3 triple-strand pocketed coils and Micro Diamond Memory Foam delivers stable spinal alignment along with cushioned pressure relief at the body's natural curves.

Level 3 represents Beautyrest's premium World Class tier and builds on Level 2 with several key upgrades. Most notably, Level 3 features T3 triple-strand pocketed coil technology versus T2 dual-strand coils, plus Micro Diamond Memory Foam infused with actual diamond particles for enhanced cooling. The cooling system, foam quality, and overall durability are all upgraded at Level 3 compared to Level 2.

Yes, a 14.5-inch mattress generally pairs best with deep-pocket or extra-deep pocket fitted sheets. Standard fitted sheets are typically designed for mattresses up to about 12 inches deep, so deeper pockets help ensure a secure, wrinkle-free fit on this taller profile.

T3 Pocketed Coil technology is Beautyrest's premium triple-strand coil design, where three strands of wire are wound together to form each coil. This delivers exceptional support, durability, and responsiveness compared to single or double-strand coils, while the pocketed construction allows each coil to move independently.

Yes, the World Class Level Three features the cool-to-the-touch InfiniCool Lux cooling cover with two layers of active cooling. This works together with the heat-conductive Micro Diamond Memory Foam and RightTemp Memory Foam to deliver Beautyrest's premium cooling experience.

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