Beautyrest K Class Firm

Anna Keller
Chief Sleep Researcher
May 23, 2023
Experts Rating:

The K Class Firm mattress from Beautyrest signifies the brand's dedication to luxury. This unique mattress features T3 Pocketed Coil® Technology that ensures robust support and alleviates pressure points for a rejuvenating sleep. The memory foam layers provide a firm, comfortable sleeping surface tailored to meet the needs of the firm mattress lovers.


The K-Class Firm features Beautyrest’s patented T3 Pocketed Coil® Technology, which provides extra support for your spine and reduces motion transfer.

Including BlackICETM 4.0 technology ensures a cool, comfortable sleep by managing heat and enhancing airflow.

The K-Class Firm uses RightTempTM Memory Foam that is infused with carbon fiber to absorb excess heat and maintain the perfect sleep temperature.


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You love a firm mattress

You sleep hot and need cooling technology

You need excellent back support

You require motion isolation due to a restless partner

You appreciate a luxury feel and design

You desire a mattress from a reputable brand


You prefer a soft or medium-firm mattress

You are on a tight budget

You prefer mattresses made of natural materials


Founded in 1870, Beautyrest has a longstanding reputation for combining innovation with luxury. Over the years, they've become synonymous with quality sleep products and their Black line, including the K-Class Firm mattress, represents the apex of their offerings. The K-Class Firm integrates advanced sleep technologies and high-quality materials to provide a restful sleep experience. With its firm feel, superior support, and outstanding temperature management, it's an excellent choice for those seeking luxurious and revitalizing sleep.

The remainder of the review will delve into a more detailed exploration of the mattress's comfort and firmness, sleep temperature, materials and construction, back support, sagging and edge support, motion isolation, cover fabric quality, durability, the company's commitment to sustainability, warranty, and customer service.

Comfort & Firmness

The Beautyrest K-Class Firm mattress is designed for sleepers who appreciate a firmer feel. The mattress effectively combines this firmness with comfort to create a sleep surface that’s both supportive and enjoyable to sleep on. The firm comfort level can be primarily attributed to Beautyrest’s T3 Pocketed Coil® Technology. This system consists of individually wrapped coils that are braided in groups of three for enhanced durability and support.

Lying on top of these coils are layers of Beautyrest’s proprietary foams, including the RightTemp™ Memory Foam, which conforms to the body's contours to relieve pressure points and provide comfort. This foam layer ensures that despite the mattress's firm nature, it doesn’t feel hard or uncomfortable. It strikes the right balance between plush comfort and firm support, making it a great choice for back and stomach sleepers who require adequate support for proper spinal alignment.

Sleep Temperature

The K-Class Firm mattress from Beautyrest incorporates several innovative technologies to ensure effective temperature regulation. The highlight is the BlackICETM 4.0 Technology, designed to keep the mattress surface cool. It consists of a cool-to-the-touch fabric and a proprietary 2-stage cooling process that dissipates heat away from the body.

Additionally, the RightTempTM Memory Foam is infused with carbon fiber that pulls heat away from the sleeper, further enhancing the mattress’s cooling capabilities. So, even if you're a hot sleeper, you won't have to worry about overheating during the night with the K-Class Firm mattress.


The K-Class Firm mattress is a perfect blend of cutting-edge sleep technology and high-quality materials. It starts with a layer of Beautyrest’s patented T3 Pocketed Coil® Technology. This coil system provides exceptional back support, reduces motion transfer, and increases the mattress's durability.

Above this coil layer is the RightTempTM Memory Foam, designed for both comfort and temperature regulation. Infused with carbon fiber, it draws heat away from the body while providing pressure relief and support.

Next is a layer of Beautyrest® Gel Memory Foam that offers additional pressure relief and enhances the mattress's cooling properties. The top layer consists of a plush comfort foam that provides a soft initial feel without sacrificing the firmness of the mattress.

Back Support

The K-Class Firm mattress offers excellent back support, thanks to the T3 Pocketed Coil® Technology. This system consists of triple-strand, individually pocketed coils that adapt to your body shape and sleeping position, providing personalized support for your spine.

The memory foam layers above the coil system add to the mattress's support capabilities by conforming to the body's contours and providing pressure relief, making the K-Class Firm an excellent choice for back and stomach sleepers or anyone struggling with back pain.

Sagging & Edge Support

One of the standout features of the Beautyrest K-Class Firm mattress is its superior edge support, which is a product of the BeautyEdge® system. This system entails a reinforced foam encasement that runs around the mattress's perimeter, enhancing its stability, increasing the usable sleep surface, and preventing sagging over time.

The T3 Pocketed Coil® Technology also plays a vital role in preventing sagging by providing even support across the mattress. So, whether you're sitting on the edge or sleeping near it, you can expect consistent support and comfort.

Motion Isolation

For co-sleepers, the Beautyrest K-Class Firm mattress offers excellent motion isolation, courtesy of its T3 Pocketed Coil® Technology. Each coil is individually wrapped and moves independently, efficiently isolating motion and reducing disturbances caused by a partner's movement. The memory foam layers also aid in minimizing motion transfer, ensuring that you can enjoy undisturbed sleep, even if you share your bed with a restless partner.

Cover Fabric Quality

The K-Class Firm mattress features a high-quality cover made from cool-to-the-touch fabric. This cover not only feels luxurious and plush but also incorporates BlackICETM 4.0 Technology that keeps the mattress cool. The cover's sleek, black design reflects the mattress's premium quality and adds to its aesthetic appeal.


Beautyrest is known for their durable mattresses, and the K-Class Firm is no exception. The mattress's core comprises the robust T3 Pocketed Coil® Technology, known for its long-lasting durability. The high-quality memory foams used in the mattress resist sagging and impressions, adding to its lifespan. With proper care, the K-Class Firm mattress can easily last for a decade or more.

Commitment to Sustainability

While Beautyrest does not market itself as an eco-friendly brand, it does take steps towards sustainability. For instance, it has partnered with SeaqualTM to create the SeaqualTM Fabric technology, which uses reclaimed ocean plastics in its fabric. Although the K-Class Firm does not feature this technology, it's a clear indication of Beautyrest's steps towards sustainability.

towards sustainability.


Beautyrest offers a 10-year warranty on the K-Class Firm mattress, reflecting their confidence in the product's durability and quality. This warranty covers manufacturing defects and any significant sagging or body impressions that exceed 1.5 inches. It's a non-prorated warranty, which means it covers the full repair or replacement costs of the mattress during the warranty period, giving buyers an additional layer of assurance.

Customer Service

Beautyrest doesn't just create premium mattresses; they also deliver premium customer service experiences. Understanding that buying a mattress is a significant investment, they place customer satisfaction at the forefront of their operations. This commitment is reflected in their various support channels - phone, email, and live chat - designed to ensure potential customers and existing owners get the assistance they need promptly.

Their customer support team is professionally trained to address a wide range of concerns, from guiding you through the mattress selection process to handling post-purchase inquiries. They exhibit an in-depth understanding of their product offerings, giving you confidence in their ability to answer your queries accurately.

The brand’s delivery process is equally commendable. Beautyrest offers a white glove delivery service for the K-Class Firm mattress, which includes the setup of the new mattress and the removal of the old one. Customers have widely reported this service to be efficient, reliable, and conducted with the utmost respect for their homes.

The brand also makes a significant effort to resolve any issues or disputes to the customer's satisfaction. While discrepancies can occur in any business, Beautyrest's consistent approach to resolving them favorably is a testament to their commitment to their customers.


Wrapping up our review, the Beautyrest K-Class Firm mattress is, without a doubt, a premium, high-performing addition to any bedroom seeking a luxurious, restful sleeping environment. It's a mattress that does not compromise on quality, comfort, or advanced sleep technology, firmly establishing itself within the upper echelons of the mattress market.

The K-Class Firm mattress truly shines in providing a well-rounded sleep experience. Its exceptional support system is particularly noteworthy, combining a robust T3 Pocketed Coil® Technology with multiple layers of pressure-relieving memory foam. This design ensures an optimal blend of firm support and contouring comfort, making the K-Class Firm mattress an ideal choice for those who prefer a firm feel without sacrificing on pressure relief.

With its impressive temperature regulation capabilities, the K-Class Firm is a godsend for hot sleepers. The use of BlackICETM 4.0 Technology and RightTempTM Memory Foam, designed to actively dissipate heat, ensures a cool, refreshing sleep experience. This feature is invaluable in today's era where more people are recognizing the importance of sleep temperature on their overall sleep quality.

Furthermore, Beautyrest's commitment to providing a first-rate customer service experience and a reassuring 10-year warranty significantly enhances the overall value of the K-Class Firm mattress. However, it's essential to note that this mattress does come at a higher price point than many other options available. While the cost might be steep for some, it is a fair reflection of the high-quality materials, luxurious comfort, and innovative technology this mattress offers.

Finally, it's worth considering that the firm feel of this mattress might not be for everyone. But for those who appreciate firm support, advanced cooling features, and a touch of luxury, investing in the Beautyrest K-Class Firm mattress could be the key to unlocking a truly transformative sleep experience.

By marrying luxury and performance, the K-Class Firm mattress truly embodies Beautyrest's century-long reputation for excellence. It stands as a testament to their continued commitment to provide a sleep experience that rejuvenates and energizes, setting you up for success in your waking life. This mattress is not just a product; it's a worthwhile investment in your overall wellbeing and quality of life.

Frequently Asked Questions

 What makes the K-Class Firm unique?

The Beautyrest K-Class Firm mattress stands out for its combination of T3 Pocketed Coil® Technology, BlackICETM 4.0 Technology, and RightTempTM Memory Foam. These technologies work together to provide superior support, excellent temperature regulation, and a firm but comfortable feel, making the mattress unique.

How does the K-Class Firm regulate sleep temperature?

The K-Class Firm mattress regulates sleep temperature through its BlackICETM 4.0 Technology and RightTempTM Memory Foam. The BlackICETM 4.0 Technology involves a cool-to-the-touch fabric and a 2-stage cooling process that drives heat away, while the RightTempTM Memory Foam is infused with carbon fiber that pulls heat away from the sleeper.

Can the K-Class Firm help with back pain?

Yes, the K-Class Firm can help with back pain. It offers excellent support due to its T3 Pocketed Coil® Technology, which adapts to your body shape and sleeping position for personalized spinal support. The memory foam layers also provide pressure relief, which can help alleviate back pain.

What is the K-Class Firm's trial period and warranty?

The K-Class Firm comes with a 10-year warranty that covers manufacturing defects and any significant sagging or body impressions. However, Beautyrest does not offer a trial period for this mattress.

Does the K-Class Firm offer free delivery?

Yes, Beautyrest offers free white glove delivery service for the K-Class Firm mattress, which includes the setup of your new mattress and the removal of your old one.

Is the K-Class Firm environmentally friendly?

While Beautyrest is taking steps towards sustainability, such as partnering with SeaqualTM to create fabric from reclaimed ocean plastics, the K-Class Firm is not marketed as an eco-friendly mattress.

How does the K-Class Firm's pricing compare to other brands?

The K-Class Firm is a luxury mattress, so it's more expensive than your average bed-in-a-box brands. However, considering the premium materials, advanced sleep technologies, and the luxury sleep experience it offers, many buyers find it worth the investment.

Can K-Class Firm mattresses be used with adjustable bases?

Yes, the K-Class Firm mattress is compatible with adjustable bases, allowing you to customize your sleep position for maximum comfort.

Is Beautyrest's customer service reliable?

Yes, Beautyrest has a reputation for providing reliable customer service. They offer support through various channels, including phone, email, and live chat, and their customer service team is known for being helpful and responsive.

Beautyrest K Class Pricing