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Adjustable Base | 4.0 Pro

Adjustable Base | 4.0 Pro

4.0 Pro Adjustable Base | Premium Comfort & Control

492+ people bought

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  • Total Customization: Adjust head, feet, pillow tilt, and lumbar support for targeted comfort and relief.
  • Relaxation-Ready: Full-body massage modes with intensity levels and wave settings.
  • Modern Convenience:Wireless backlit remote, underbed lighting, and adjustable legs for a sleek, tailored fit.
Size Size guide

Twin XL

$1,200

Queen

$1,400

King

$1,600

Split King

$2,400

Total Price
$1,200.00

In stock. Delivery by August 16

Our benefits

2,100+ Five Star Reviews

Free One-Day Delivery

20 Year Warranty

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Product Details

Discover the ultimate in sleep customization with the 4.0 Pro Adjustable Base from Mattress King. Designed for those who want it all, this feature-rich base provides unmatched comfort, control, and support with:

  • Advanced Adjustability: Elevate your sleep with head and foot articulation, plus pillow tilt for neck support and adjustable lumbar support for lower back relief. Whether you’re watching TV, reading, or sleeping, find your perfect angle with ease.
  • Soothing Massage Functions: Enjoy whisper-quiet, full-body massage with multiple intensity levels and wave, pulse, and steady modes. Ideal for reducing tension and promoting relaxation before bed.
  • Modern Remote Convenience: A wireless, backlit remote gives you effortless control — with programmable presets, flashlight, and intuitive navigation right at your fingertips.
  • Stylish & Functional Design: Underbed lighting for nighttime visibility, plus 3-in-1 adjustable legs (3", 4", 6") to customize your bed height and seamlessly fit within any frame.
  • Heavy-Duty Performance: Built with upgraded 850 lb lifting capacity and backed by a 20-year limited warranty — engineered for strength, comfort, and long-lasting reliability.

Warranty

20-Year Limited Warranty

Enjoy peace of mind with our Adjustable Base | 4.0 Pro, which comes with a comprehensive 20-year manufacturer warranty. For complete warranty information and details, please click here.

Where it’s made

Made in China

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A closer look at the Adjustable Base | 4.0 Pro

The 4.0 Pro Adjustable Base is built for those who want it all. Experience ultimate comfort with pillow tilt, adjustable lumbar support, full-body massage modes, and underbed lighting — all controlled by a backlit wireless remote. With heavy-duty lift power and customizable leg heights, it’s our most advanced base yet.

visual of Intuitive Remote Control
1

Intuitive Remote Control

Navigate your comfort effortlessly with a sleek, wireless backlit remote. Save up to four of your favorite positions and adjust everything — from head to feet to pillow tilt and lumbar — with one-touch simplicity.

visual of Relaxing, Quiet Massage
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Relaxing, Quiet Massage

Melt away stress with multi-mode massage that targets both upper and lower body. Choose from solid, wave, or pulse settings with variable speeds and intensities for soothing, full-body relaxation right from your bed.

visual of Enhanced Pillow Tilt
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Enhanced Pillow Tilt

Fine-tune your head lift with precision. Pillow tilt adds an extra pivot point near the top of the base for improved support under your neck and head — ideal for reading, TV, or extra neck relief.

visual of Adjustable Lumbar Support
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Adjustable Lumbar Support

Support where it matters most. A built-in lumbar bar lifts up to 5 inches to provide firm, targeted support to your lower back — great for back and stomach sleepers alike.

visual of Underbed Lighting
5

Underbed Lighting

Soft-glow underbed lights gently illuminate your space, making late-night movement safer and more comfortable without disturbing your sleep environment.

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Customizable Height

Our three-in-one leg design includes 3", 4", and 6" segments for height options up to 13". Whether you want a lower profile or maximum clearance, you’re in control.

Customer Reviews

Discover what our customers say about Mattress King.

4.9

2,148 reviews

Frequently Asked Questions

Do Mattress King products come with a warranty?

Absolutely! At Mattress King, every product we offer is backed by a manufacturer's warranty, ensuring peace of mind with your purchase. The specific warranty details for each product vary, so we encourage you to read through our list of warranties here. This will provide you with all the information you need regarding the coverage and terms for each item. Rest assured, we're committed to providing quality products with reliable warranty support.

You can find more information on our warranty here. To learn more about the Mattress King comfort guarantee, click here.

Do you offer financing options?

At Mattress King, we offer a variety of financing options to fit your budget. Our financing partners include Synchrony, Affirm, and Snap Finance, each offering distinct plans to accommodate different financial needs.

Synchrony: For those with good credit, Synchrony provides a 12-month plan with 0% interest, helping you manage payments without additional costs.

Affirm: Affirm offers flexibility with interest rates ranging from 0% to 36%. They provide three payment term options, allowing you to choose a plan that best suits your budget.

Snap Finance: Ideal for those who might not have a strong credit history. Snap Finance considers other factors like a steady income and an active checking account. They offer a 100-day cash option and operate on a lease-to-own basis.

Each of these options is designed to make your mattress purchase more manageable financially. You can explore these options and apply directly to find the one that aligns with your financial situation.

Is there a return or trial policy for the adjustable base?

At Mattress King, the adjustable bases are not eligible for a trial period. Additionally, we do not offer a specialized return policy for these items beyond our standard return policy. It's important for customers to carefully consider their purchase of an adjustable base, as the standard return policy terms will apply. We encourage customers to review our standard return policy here for more detailed information and to ensure clarity on the conditions and processes involved.

Do I need a boxspring or foundation for my mattress?

Understanding whether you need a boxspring or foundation for your mattress is crucial. Often, these terms are used interchangeably, with modern boxsprings essentially acting as foundations without actual springs. The necessity of a boxspring or foundation depends largely on your bed frame.

For Traditional Bed Frames: If your bed frame has fewer than 10 slats or crossbars, a boxspring or foundation is necessary. It provides a level, stable surface, ensuring your mattress is properly supported. This helps in maintaining the mattress's structure and can extend its lifespan.

For Platform Beds: Many contemporary bed frames are designed as platform frames. These usually include 11 or more slats or a solid steel grid, eliminating the need for a separate foundation. Platform beds offer sufficient support for your mattress on their own.

Adjustable Bases: The rising popularity of adjustable bases, which can raise and lower your head and feet, has also influenced mattress support. These bases are self-supporting and designed to offer optimal mattress support without needing an additional foundation.

Importance of Proper Support: Regardless of your bed type, ensuring your mattress rests on a solid, level surface is vital. This not only helps in keeping your spine properly aligned but also enhances the overall comfort and durability of your mattress.

Further Guidance: For more information on choosing the right foundation for your mattress and insights into various bed types, you can explore our detailed Mattress Buying Guide. Here, we also offer a range of accompanying products that complement your mattress choice, ensuring you have everything you need for a great night’s sleep.

How do adjustable beds work?

Adjustable beds, also known as electric beds, allow personalized comfort through a metal frame with pivot points and actuators. You can adjust the head and foot sections independently using a remote control, catering to your preferred sleeping or sitting position.

What mattresses are compatible with adjustable beds?

Most modern mattresses, including individual pocketed coil, hybrid, memory foam, latex, or gel, are compatible with adjustable bases. Their flexible design conforms to the movement of the base. Old style mattresses with open coils and a border wire are not compatible because the border wire won't conform to the adjustable base. It's always best to check with a representative to confirm compatibility.

Can I use a bed frame or headboard with an adjustable base?

Yes, adjustable bases fit standard dimensions and can comfortably sit inside a bed frame. If your frame has slats, they should be removable so the adjustable base can rest inside the cavity of you bed frame. Optional headboard brackets are available for attaching a standalone headboard.