Best King Size Memory Foam Mattress Toppers Reviews

Mattress toppers come in different sizes just like mattresses. So you need to find the right size for your mattress. Not all toppers advertised as king size are exactly that, some come shorter. For your information, a king-size memory foam mattress topper measures 80 inches long by 76 inches wide.

A king size mattress topper provides enough room for two adults and a kid. Similarly, densities and thicknesses differ and it’s up to you to choose what is best for you.

In this Best King Size Memory Foam Mattress Topper Reviews, we present you our top choices. Please review them before making a decision.

Top 6 Choices: The Best King Size Memory Foam Mattress Toppers With ReviewsYour Heading Here




Cooling properties

Firmness Level



Gel-infused memory foam


Specially formulated cooling gel

Firm & very supportive

10 years

100% memory foam


Temperature sensitive memory foam


5 years

Gel memory foam


Cooling gel

Open-cell technology


3 years

Gel-infused memory foam


Ventilated design

Specially formulated cooling gel


3 years

Memory foam


Temperature sensitive memory foam


10 years

Gel-infused memory foam

Single- layered

Specially formulated cooling Gel


3 years

Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

• Offers a heavenly sleep experience

The Sleep Innovation 4” topper stands out when it comes to luxurious sleep. Its cover is ultra-soft and allows you to sink deep and this makes you feel like you are sleeping on a puffy cloud. This explains why you will sleep beyond the alarm.

• Pretty double-layer construction

The top layer this double layered topper is a 2” of fluffy fiberfill in an ultra-soft-quilted cover sitting on a 2-inch thick cooling gel memory foam. This structure yields unbeatable comfort combined with a gentle, pressure-relieving support.

• Responds to unique body shape and sleep style

Nothing soothes better sleep that a personalized comfort and support. The memory foam used in this topper is proven to respond to the body curves and sleep style.

• Yields less tossing, less turning and deeper sleep

This king size topper is made from ensures all the pressure points are properly suspended so that you can experience less tossing, less turning and more deep sleep.

• Snug-fit and easy to wash cover

You will love the fact that the included cover fits nicely and keeps both layers in position. Beyond this, it is to remove it and wash. And the best part of this cover is that it is washer and dryer safe.

• Best for side, back, and stomach sleepers

No matter your sleeping style, this mattress topper won’t disappoint. Its twin layer construction combined with a 3-pound density provides the right amount of support required for different sleeping styles.

• Sleeps cool

Sleep Innovation memory foam topper is gel-infused. This memory foam offers more airflow which prevents sleeping hot.


• The twin layer is not 100% memory foam

One layer is gel infused memory foam and the other side is a plush down material.


Offers a heavenly sleep experience


  • The twin layer is not 100% memory foam

Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

• Body conforming memory

Best Price 4” memory foam is made from a unique body conforming memory foam. This foam is known to respond well to body contours. This ensures all the pressure points are properly supported so you can sleep comfortably.

• Twin-layered

The Best Price 4” topper features a unique double layer construction. The topmost layer is a soft 1.5” thick memory foam while the bottom layer is a 2.5 high-density foam. The benefit of this construction is that you can choose the perfect firmness your body needs. If you want a soft feel sleep on the 1.5” inch foam side and if you want a firmer feel then try the high-density foam side.

• Reduces tossing and turning

Being made of a body conforming memory, this topper creates a responsive active suspension. The resultant suspension helps reduce motion transfer from your sleep partner. What this means for you is that you won’t feel the movements when your partner tosses and turn.

• Relieves pressure points

As mentioned above, this topper features a responsive active suspension that isolates and reduce motion transfer between sleep partners. Another important aspect of the Best Price 4” topper is the ability to relieve pressure points through even distribution of body weight.

• CertiPUR-US certification

This certification is a guarantee of quality and safety.  The Best Price memory foam topper has been analyzed by an accredited independent testing laboratory to comply with the guidelines and standards for content, emission, and durability.

• Longest warranty in its class

As an indicator of value, this Best Price 4” topper has the longest warranty backing against all other Best Price toppers in its class. 5-year manufacturer warranty means it is a topper that will serve you for a long time without anything to complain about.


• Not ventilated

This memory topper is not ventilated so it tends to overheat

• Not 100% memory foam

its just 1.5” thick layer that is made of memory foam the other part is just ordinary high-density foam.


  • Body conforming memory
  • Twin-layered
  • Reduces tossing and turning
  • Relieves pressure points
  • CertiPUR-US certification
  • Longest warranty in its class
  • CONS

    Not ventilated

    Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

    • Provides luxurious comfort

    The Milliard memory topper is constructed with a luxurious 2” thick that is 100% gel memory foam. The good thing with this construction is that the topper contours softly to the body curves. The active suspension created reduces pressure points, relieves stress, joint, muscle pain, and arthritis signs.

    • Cooling gel properties

    This memory foam topper features a unique open-cell technology that works together with gel infused beads to regulate sleep temperature while you sleep. A cool sleep environment is an important ingredient towards a quality sleep.

    • Reliable durability

    This topper is made of a premium 3-pound density foam which has the longest lifespan in its class. The high density of this topper prevents it from flattening and this means that it is able to hold up its shape over time.

    • Offers allergy relief

    This memory foam topper is CertiPUR-US certified to be made from safe ingredients. In addition to this, the memory foam used in this topper is shown to be naturally hypoallergenic which a big plus is for allergy sufferers. That’s not all, the foam used also has anti-microbial qualities which boost its safety.

    • Cost-effective

    When it comes to affordability, the Milliard 2” thick memory foam topper gives you the opportunity to revitalize your old mattress to experience the luxury of a premium mattress at an affordable cost.


    • Uncomfortable initial odor

    When new you will notice a disturbing smell coming out of the topper. Ensure you allow enough time for dissipation if you are sensitive to smell.


  • Provides luxurious comfort
  • Cooling gel properties
  • Reliable durability
  • Offers allergy relief
  • Cost-effective
  • CONS

    • Uncomfortable initial odor

    Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

    • Doesn’t hold heat

    This topper is gel infused to reduce heat retention. Furthermore, it also has many fine vertical holes running from the top to the bottom to increase airflow into the topper. As air flows out it carries with it the heat that has accumulated.

     Finally, it uses an open-cell technology that enhances breathability. The combination of gel, ventilation and open-cell technology creates a cool and comfortable sleep environment.
    • Medium softness and body support

    This topper is 2.5” thick and the Gel infused memory has a density of 3 pounds which means it will provide medium-level softness and body support. This combination of softness and density provides adequate body support that is ideal to make you comfortable.

    • Conforming support

    This topper is made from memory foam which is well-known for its ability to conform to the body curves. The support it offers helps to reduce pressure points around the shoulders, hips, and feet.

    • Direct from the manufacturer quality

    This topper comes directly from the manufacturer and the most interesting thing is that every LUCID product is made with care and quality components. Since the manufacturer has confidence in its construction and performance and therefore stands behind with a 3-year warranty.

    • Eco-friendly

    The memory foam used in this mattress topper has met the CertiPUR-US safety guidelines and standards. You can own this mattress topper and have peace of mind that it will do no harm to you and the environment.


    • Mild-strong odor

    This topper emits a strong foam odor which can be uncomfortable. However, the smell goes away after a few days.

    • Hard to return

    Be careful when trying this topper because it has a short return window.


    • Medium softness and body support
    • Conforming support
    • Direct from the manufacturer quality
    • Eco-friendly
    • Doesn’t hold heat


    • Mild-strong odor

    • Hard to return

    Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

    • Utilizes an incredible technology

    In a unique way, this topper blends the feel of a conventional innerspring mattress inside a pillow top. This construction allows you to experience both worlds of the supportive mattress and a peaceful sleep time.

    • Extends the lifespan of the mattress

    This topper is designed to sit well on your mattress and bridge the hard and uneven feeling of the existing mattress. The direct contact with the mattress minimizes pressure on the mattress and this extends the life of your mattress.

    • Diminishes pressure points

    If you suffer chronic disorders like back pains, the 2-inch memory foam and 1.5-inch opulent fiber filling will give you a pressure relieving comfort. The good thing is that the cushioning is adequate to eliminate pressure points. In turn, you end up tossing and turning less.

    • Eco-friendly construction

    The Sleep Innovation memory foam topper is made in the USA. This indicates that it is indeed high quality and certified under CertiPUR-US to be eco-friendly and without harmful effects on human health.

    • 10-year warranty backing

    It comes with an impressive warranty and this means you will have no headache if anything goes wrong with your purchase.

    • Removable and machine washable cover

    Another cool thing about this Sleep Innovations Instant Pillow Top is its cover that removes easily and it is machine safe. This will help you keep it clean effortlessly.


    • It is not ventilated

    The lack of ventilation mechanism means it will hold heat. Excess heat will make your night sweaty and uncomfortable.


  • Utilizes an incredible technology
  • Extends the lifespan of the mattress
  • Diminishes pressure points
  • Eco-friendly construction
  • 10-year warranty backing
  • Removable and machine washable cover
  • CONS

    • It is not ventilated

    Why we consider this as one of the best King Size Memory Foam Mattress Toppers?

    • 3-inch of 100% gel –infused memory foam

    The Serta memory foam topper features a beautiful one layer design. Unlike other toppers that features a separate layer of gel, the whole of this topper is gel infused. Premium memory foam is swirled with gel for balanced comfort, support, and cooling sleep temperature.

    • Regulates sleep temperature

    The Serta allows you to experience cooler nights all long, thanks to the tiny gel beads infused in the memory foam. The gel beads are very important when it comes to temperature regulation. Gel beads boost dissipation of body heat and this prevents you from sleeping hot.

    • Amazing comfort

    This topper is about 2 pounds and 3-inch thick. This construction is suitable for someone looking for soft and comfortable sleep environment. On the other hand, this topper easily molds to the body curves for proper spinal alignment and increased blood circulation.

    • Best for outdoor use

    Unlike other toppers, the Serta 3” gel-memory foam is lightweight. Being lightweight, it means that you can roll it easily and move it from place to place. Therefore, if you love camping out, this is a great choice you may want to consider.

    • Decompresses to full-size in 24 hours

    Most toppers require up to 72 hours to get to its original size. The best part of this topper is that it takes just 24 hours to decompress to full size. This is beneficial because you will be able to use it the next night after unwrapping.


    • Too soft for backpains

    This topper is way too soft, this means you will sink deep into the memory. As a result, the spinal column will be wrongly aligned worsening back pains.

    • Strong foam odor

    this is a common problem with memory foam toppers. Worry not because the smell will go away after a few days.


  • 3-inch of 100% gel –infused memory foam
  • Regulate sleep temperature
  • Amazing comfort
  • Best for outdoor use
  • Decompresses to full-size in 24 hours
  • CONS

    Too soft for backpains

    • Strong foam odor

    So... What is the best kind size memory foam mattress topper?

    Are you are looking for a king size memory foam mattress topper that; sleeps cool, offers a heavenly sleep experience, gives you personalized comfort and body support, sleep without tossing and turning, perfect for both side, back and stomach sleepers?

    Well, the Sleep Innovations 4-Inch Dual Layer King Mattress Topper is the editor’s choice that will provide these benefits among others. However, you may also try out the rest of our top choices, they are great and you can’t go wrong with them. Sleep like a king with any of our top choices.