Simmons Beautyrest World Class 14.25" Extra Firm Mattress on a wooden bed frame in a luxury bedroom.

Simmons Beautyrest World Class 14.25 Inch Extra Firm Mattress with grey quilting and purple piping.

Close-up of Beautyrest World Class extra firm mattress texture for back and stomach sleeper support.

Simmons Beautyrest World Class 14.25" Extra Firm Mattress and matching foundation for stable support.

Diagram of Beautyrest World Class mattress layers showing extra firm support and cooling technology.

Simmons Beautyrest World Class Level Three Extra Firm 14.25 Inch Mattress

Plush Medium Firm Pillow top Memory foam Hybrid

Simmons Beautyrest World Class Level Three Extra Firm 14.25 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 Simmons Beautyrest World Class Level Three Extra Firm Mattress delivers Beautyrest's premium triple-strand coil support and advanced cooling innovations in a structured 14.25-inch high-profile build.

Cloudy Mattress is an Authorized Beautyrest retailer, so every purchase is backed by Simmons' full manufacturer warranty. The feel sits firmly on the extra-firm end of the comfort scale, delivering the no-sink structural support that back and stomach sleepers often seek.

Because of this stable, rigid-leaning response, it ranks among the best extra firm mattress for back pain options for sleepers who need substantial spinal support. Inside, multiple engineered components work together, starting with an InfiniCool Lux cooling cover that delivers cool-to-the-touch surface comfort.

This Simmons Beautyrest Harmony Lux Diamond Series member uses two layers of active cooling at the surface to help you fall asleep faster on warm nights. Furthermore, the cover features Seaqual Initiative recycled fabric, transforming ocean plastics into high-quality upcycled fibers for a more sustainable cover.

Beneath the cooling cover, Micro Diamond Memory Foam is infused with actual diamond particles engineered to conduct heat away from the body. This cool-to-the-touch comfort layer pairs with SurfaceTouch Gel Memory Foam at the quilted surface for advanced pressure point relief from the moment you lie down.

The mattress also features Beautyrest's premium T3 Pocketed Coil Technology, an exclusive T3 Dual-Strand Pocketed Coils design with triple-strand wire construction.This triple-strand coil support delivers Beautyrest's highest level of individualized support, ideal for pressure-relieving orthopedic support and ultimate spinal alignment.

The pocketed construction also provides advanced motion separation, making this an excellent choice for couples sharing the bed. A high-density base foam anchors the build, delivering edge-to-edge stability and lasting hotel-quality extra firm feel for years to come.

At a generous 14.25" high profile mattress height, this luxury extra firm mattress Simmons model is fully adjustable-base compatible. Additionally, the mattress is made in the USA, built with CertiPUR-US certified foam, and backed by a 10-year limited warranty.

Extra Firm Structural Support

This extra-firm pocketed coil mattress delivers no-sink support ideal for back and stomach sleepers seeking ultimate spinal alignment.

T3 Triple-Strand Pocketed Coils

Beautyrest's premier T3 Pocketed Coil Technology uses triple-strand wire construction 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

The InfiniCool Lux cooling cover provides two layers of active cooling with cool-to-the-touch comfort at the sleep surface.

Immediate Pressure Relief

SurfaceTouch Gel Memory Foam sits at the quilted surface to deliver advanced pressure point relief from the moment you lie down.

Sustainable Ocean-Recovered

Fabric Seaqual Initiative recycled fabric transforms recovered ocean plastics into a luxurious cover for environmentally responsible sleep.

Advanced Motion Separation

Pocketed coils absorb energy to deliver advanced motion separation, so partner movement is far less noticeable through the night.

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 Initiative recycled 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 wave-pattern construction adds airflow through this critical mid-mattress layer.

The premium T3 Dual-Strand Pocketed Coils feature 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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Exactly what I needed

Exactly what I needed. Firm, supportive, and I wake up refreshed every morning.

Truly luxury quality in every detail

The stitching, the cover material, the coil response — every detail of this mattress communicates quality. The 14.25-inch profile looks stunning on our bed frame. When you lie down the extra firm support is immediate and reassuring. This doesn't feel like any other 'extra firm' mattress I've tried. It feels engineered. Beautyrest World Class is the right name for it.

Ankylosing spondylitis — the right support matters

Living with ankylosing spondylitis means my spine needs firm, flat support during sleep to prevent inflammation from worsening overnight. My rheumatologist specifically recommended extra firm with pocketed coils for my condition. The Beautyrest Level Three is the first mattress in years that I wake up on feeling genuinely rested rather than stiff and flared. This is a meaningful quality of life improvement.

Our guest room guests are sleeping longer

We put this in the guest room expecting our guests to prefer our old softer mattress. Instead every single guest has commented on how well they slept and asked about the mattress. Two have already ordered their own. The extra firm feel appeals to more people than we expected. Guests who are back sleepers and stomach sleepers especially love it.

Seven months in — still holding firm

I specifically waited to review this because I wanted to see how it held up over time. Seven months in: zero softening, no body impressions, the extra firm feel is identical to day one. I rotate every 90 days and that's all the maintenance needed. The coil system in Beautyrest mattresses is engineered to maintain their feel long-term and this one proves it. Exceptional quality.

HAVE QUESTIONS?

WE'VE GOT ANSWERS

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

The World Class Level 3 Extra Firm is designed with premium T3 triple-strand pocketed coil support and structured foam layering, all of which promote spinal alignment. Many sleepers with back pain prefer extra-firm mattresses for the substantial structural support they provide.

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.

This particular World Class Level Three Extra Firm model measures 14.25 inches in total height. The thickness combines the quilted cooling cover, SurfaceTouch and Micro Diamond memory foam comfort layers, RightTemp Wave Foam, the T3 pocketed coil support core, and the durable base foam foundation.

Beautyrest mattresses require proper support to maintain the warranty. The mattress can be placed on a Beautyrest foundation, an adjustable base, or a platform bed with proper slat support. Cloudy Mattress also offers an optional box spring with a metal foundation as an add-on at checkout.

Yes, the World Class Level Three features Beautyrest's most advanced cooling technology stack. This includes the cool-to-the-touch InfiniCool Lux cover with two layers of active cooling, Micro Diamond Memory Foam with heat-conductive diamond particles, RightTemp Wave Foam with carbon fibers, and the breathable Seaqual sustainable fabric cover.

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